ALGT


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NonoperatingIncomeExpense

us-gaap:OperatingExpenses

us-gaap:OperatingIncomeLoss
us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:StatementBusinessSegments

us-gaap:Revenues

us-gaap:SellingAndMarketingExpense

us-gaap:Assets
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ShortTermInvestments

us-gaap:ReceivablesNetCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:LiabilitiesCurrent
us-gaap:ConsolidatedEntities

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent
us-gaap:ConsolidatedEntities
us-gaap:LiabilitiesNoncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:SecuredLongTermDebt
us-gaap:LongtermDebtType

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredTaxLiabilitiesNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet
algt:Deferred

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue
us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital
us-gaap:StatementEquityComponents

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValue
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquireProductiveAssets
us-gaap:StatementBusinessSegments

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:PaymentsOfDividends
us-gaap:StatementEquityComponents

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits
us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType
algt:Aircraftscheduledtobeacquired
us-gaap:LongLivedAssetsHeldForSaleByAssetType
algt:CarryingValueOfAssetHeldForSaleBuilding

algt:DiscreteIncomeTaxExpenseBenefit

algt:FixedFeeContractRevenue
us-gaap:StatementBusinessSegments

algt:GrantsRecognizedCARESAct

algt:NetIncomeLossAvailableToCommonStockholderBasic
us-gaap:StatementBusinessSegments
algt:NonOperatingSpecialCharge

algt:NonOperatingSpecialChargeTotal

algt:OperatingLeasedAssetsNumberofUnits
us-gaap:StatementBusinessSegments
algt:OperatingSpecialCharge

algt:OperatingSpecialChargeTotal

algt:OtherAircraftRelatedCosts

algt:OtherOperatingRevenue
us-gaap:StatementBusinessSegments

algt:Pointsawarded

algt:Pointsredeemed
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
algt:ProceedsFromPayrollSupportProgramLowInterestLoan
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

algt:ProceedsfromGovernmentAssistancePayrollSupportProgramCARESAct
us-gaap:SubsequentEventType
us-gaap:UnusualOrInfrequentItem

algt:SecuritiesExcludedFromComputationOfEarningsPerShareAmounts

algt:SpecialChargesTotal
us-gaap:StatementBusinessSegments

algt:SpecialItemImpairmentcharges

algt:StationOperations
us-gaap:StatementEquityComponents
algt:StockIssuedDuringPeriodSharesStockOptionsSARsExercised

algt:ThirdPartyProducts
us-gaap:StatementBusinessSegments

algt:TwoClassMethodWeightedAverageNumberofSharesOutstandingDiluted

algt:WeightedAverageNumberOfDilutedSharesOutstandingTreasuryStockMethod

us-gaap:AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
us-gaap:StatementEquityComponents
us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued

us-gaap:AircraftMaintenanceMaterialsAndRepairs

us-gaap:AircraftRental

us-gaap:AssetImpairmentCharges
us-gaap:StatementBusinessSegments

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:DepreciationAndAmortization
us-gaap:StatementBusinessSegments

us-gaap:FuelCosts

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestCostsCapitalizedAdjustment

us-gaap:InterestCostsIncurred

us-gaap:InterestRevenueExpenseNet
us-gaap:StatementBusinessSegments

us-gaap:InvestmentIncomeInterest

us-gaap:LaborAndRelatedExpense
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityPeriodicPaymentPrincipal

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherExpenses

us-gaap:OtherNonoperatingExpense

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherRestructuringCosts

us-gaap:PaymentsForLoans
us-gaap:SubsequentEventType

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsToAcquireAvailableForSaleSecurities

us-gaap:PostemploymentBenefitsPeriodExpense
us-gaap:StatementBusinessSegments

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:RepaymentsOfDebtAndCapitalLeaseObligations
us-gaap:LongtermDebtType
us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RestructuringSettlementAndImpairmentProvisions

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:SaleAndLeasebackTransactionGainLossNet

us-gaap:SaleLeasebackTransactionNetProceedsFinancingActivities

us-gaap:SaleLeasebackTransactionNetProceedsInvestingActivities

us-gaap:StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants
us-gaap:SubsequentEventType
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockSharesAcquired
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted
us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem
algt:AdditionalProceedsReceivedFromPayrollSupportProgram
us-gaap:UnusualOrInfrequentItem

algt:AirTrafficLiabilityRecognized
us-gaap:LongLivedAssetsHeldForSaleByAssetType
algt:AssetsHeldForSaleLongLivedCarryingValue

algt:ComputerHardwareandSoftware
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
algt:DebtInstrumentAmountNeedToExceedToDisburseNote
us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem

algt:DeferredMaintenanceCostsNetNoncurrent

algt:Expendablepartssuppliesandfuelnetofallowance

algt:Expendablepartssuppliesandfuelreserve
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
algt:IncreaseInDebtInstrumentForAdditionalInstallment
us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem

algt:Landandbuildingsleaseholdimprovements

algt:MaintenanceAndRepairs

algt:NetOperatingLossCarryback

algt:Operatingrightofuseassetnet

algt:Passengerfeespayable

algt:PercentOfSecuritiesToBeIssuedBasedOnAmountOfNoteIssued

algt:PointsLiability
us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem
algt:ProceedsExpectedFromPayrollSupportProgram

algt:ProceedsReceivedFromPayrollSupportProgram
us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem

algt:StationExpenses

algt:SunseekerResortDevelopment

algt:TotalLeaseLiability
us-gaap:UnusualOrInfrequentItem
algt:TotalProceedsFromPayrollSupportProgramGrant

algt:TotalProceedsToBeProvidedToUSAirlinesFromPayrollSupportProgramExtension

algt:TotalRightofUseAsset

algt:WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan

dei:EntityCommonStockSharesOutstanding

us-gaap:AccountsReceivableGrossNoncurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent

us-gaap:AccruedAdvertisingCurrentAndNoncurrent

us-gaap:AccumulatedAmortizationOfOtherDeferredCosts

us-gaap:AirTrafficLiabilityCurrent

us-gaap:AvailableForSaleSecuritiesCurrent

us-gaap:CapitalizedComputerSoftwareNet
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem
us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
us-gaap:UnusualOrInfrequentItem

us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
us-gaap:SubsequentEventType

us-gaap:ContractWithCustomerLiability

us-gaap:CustomerLoyaltyProgramLiabilityNoncurrent
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentFaceAmount
us-gaap:LongtermDebtType
us-gaap:SubsequentEventType
us-gaap:UnusualOrInfrequentItem

us-gaap:DeferredFinanceCostsCurrentGross

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredFinanceCostsNoncurrentGross
algt:DeferredNoncurrent
us-gaap:DeferredIncomeTaxLiabilities
algt:DeferredNoncurrent
us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxLiabilitiesOther
algt:DeferredNoncurrent
algt:DeferredNoncurrent
us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

us-gaap:DividendsPayableAmountPerShare

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FlightEquipmentGross

us-gaap:IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority

us-gaap:InterestPayableCurrent

us-gaap:InventoryValuationReserves

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
us-gaap:DebtInstrument
us-gaap:LongtermDebtWeightedAverageInterestRate
us-gaap:DebtInstrument
us-gaap:NotesPayable

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:PropertyPlantAndEquipmentOther

us-gaap:PropertyPlantAndEquipmentOwnedAccumulatedDepreciation

us-gaap:PurchaseObligation

us-gaap:PurchaseObligationDueInNextTwelveMonths

us-gaap:PurchaseObligationDueInSecondYear

us-gaap:RestrictedCash

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount

us-gaap:UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear

us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Other Nonoperating Income Expense
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Operating Lease Right Of Use Asset
Current Assets
Prepaid Expense And Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Current Liabilities
Operating Lease Liability Current
Noncurrent Liabilities
Other Liabilities Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Common Stock Dividends Per Share Declared
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Payments For Repurchase Of Common Stock
Shares
Weighted Average Number Of Diluted Shares Outstanding
OperatingLeaseLiability
Operating Lease Liability Current
NonoperatingIncomeExpense
Nonoperating Income Expense
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CommonStockValue █▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁0.0250.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.022NA0.021NANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock█▂▂▂▂▁▂▁▂▂▁▁▁▁▁17.98616.41616.40516.29816.2416.19916.30316.19516.30516.28416.18316.15916.16116.15116.066NANANA16.633NANANA16.803NANANA17.413NANANA18.544NANANA19.334NANANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding NA16.167NA16.00615.90215.952NA16.03916.06916.013NA15.96215.94515.898NA15.86216.2216.404NA16.40616.44216.699NA16.86916.99217.237NA17.70417.86518.248NA18.79419.04119.207NA19.30519.30319.2NA19.12819.13119.09NA19.56920.17
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁17.06416.167NA16.00615.90215.952NA16.03716.06316.011NA15.95715.93915.889NA15.85216.19816.382NA16.38916.4216.678NA16.83116.95417.197NA17.60517.77718.166NA18.62918.92119.081NA19.11619.05318.989NA18.9418.93118.909NA19.34919.805
us-gaap:EarningsPerShareBasic █▅▄▃▁▃▇▆▇▇▆▅▇▇█▅▆▆▆▆▇▇▇▆▇▇▅▅▆▆▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅5.490.42-1.7799999999999994-1.82-5.85-2.083.7199999999999992.74.333.522.55999999999999960.943.13.435.091.392.942.52.492.763.694.293.40000000000000042.633.193.750.290.81.871.870.960.911.351.660.780.881.311.130.560.50.630.90.65999999999999970.680.88
us-gaap:EarningsPerShareDiluted █▅▄▃▁▃▇▆▇▇▆▅▇▇█▅▆▆▆▆▇▇▇▆▇▇▅▅▆▆▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅5.490.42-1.7799999999999994-1.82-5.85-2.083.72000000000000062.74.333.522.550.943.13.425.081.392.942.52.48000000000000042.753.684.293.3899999999999992.623.183.740.270.81.861.860.940.911.341.650.760.871.31.120.560.490.620.890.64999999999999990.670.87
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 Operating Margin us-gaap:StatementBusinessSegments algt:AllegiantAirNANA224.84181.916116.52378.911416.977391.222454.779419.977376.258355.1405.572NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 TTM Greenblatt ROC _ _█▅▄▃▁▁▇▆▇▇▆▅▆▆▅▅▇▆▆▆▇█▇▆▇▇▅▅▆▆▅▅▅▆▅▅▅▅▅▅▅▅138.85124.602-23.648-33.081-113.252-117.80592.65272.116108.10591.07863.08826.18174.22279.96826.16942.91685.19672.88868.11676.84104.476121.12693.76277.08292.756108.09914.7928.86756.41357.27130.28129.23242.85652.36725.37728.74841.86836.31120.17416.73120.71227.827NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest █▅▃▃▁▃▇▆▇▇▆▅▆▆▇▅▆▆▆▆▇▇▇▆▆▇▅▅▆▆▅▅▅▆▅▅▅▅▅▅94.9016.897-29.048-29.384-92.054-33.73160.5943.96270.72957.59542.01216.39351.50254.07481.30722.03847.67741.2741.02345.13560.79971.56956.01644.31653.97765.6435.2914.59133.56434.08317.22217.03725.69431.88314.5316.97725.24721.61710.8459.403NANANANANA
us-gaap:GainsLossesOnExtinguishmentOfDebt 0.071NA0.00.00.0-1.2220.00.00.0-3.6770.00.00.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest █▅▄▄▁▁▇▆▇▇▆▅▆▇▅▆▇▇▆▇▇█▇▇▇▇▅▅▆▆▆▆▆▆▅▆▆▆▅▅▅▆122.5718.67-39.217-44.708-146.416-130.72678.63456.90591.78973.91952.46814.41563.04369.39116.43134.72978.27566.11162.00970.99198.096114.86288.24570.76386.336101.3747.67921.97753.13154.34527.77427.51740.9150.47923.45226.81539.85434.52618.43814.89218.88327.301NANANA
us-gaap:IncomeTaxExpenseBenefit ▇▆▅▅▃▁▇▇▇▇▆▆▇▇▃▆▇▇▇▇██▇▇▇█▆▆▇▇▆▆▇▇▆▆▇▇▆▆▆▆▆▆▆27.5441.801-10.379-15.565-53.313-97.71718.11312.97621.24616.79511.022-0.73213.02714.198-66.07112.43629.824.47920.69925.53837.24942.88231.53626.30531.99736.5512.9287.86619.76420.2710.5110.5215.22318.6488.819.92914.67112.8237.6285.4066.93410.1488.1526.07210.241
us-gaap:IncomeTaxesPaidNet ▅▅▅▂▃▅▅▅▅▄▁█▃▅▅▄▄▅▆▅▆▆▆▆5.011-0.1380.029-49.937-45.3430.0220.071.1131.15-4.49-82.75582.429-41.3210.0370.803-18.757-0.3740.37430.79419.8932.08227.84625.40332.093NANANANANANANANANANANANANA37.937NANANANANANANA
us-gaap:InterestExpense NA16.78816.34411.94314.05318.15318.2719.50620.94218.08313.57414.30913.15612.72411.65810.0418.8898.4017.2696.9387.397.23947.041-6.687-7.017-6.82635.022-7.097-3.591-3.128-2.754-2.257-2.294-2.188-2.21-2.255-2.2-2.074-1.889-2.255-2.235-0.796-0.522-0.596-0.655
us-gaap:InterestPaidNet ▁█11.3215.059NA10.73614.03412.031NA16.20315.96220.924NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss █▅▃▃▁▃▇▆▇▇▆▅▆▇█▅▆▆▆▆▇▇▇▆▆▇▅▅▆▆▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅95.0276.869-28.838-29.143-93.103-33.00960.52143.92970.54357.12441.44615.14750.01655.19382.50222.29348.47541.63241.3145.45360.84771.9856.70944.45854.33964.8674.79414.17233.49934.22217.47617.10625.7631.93214.76616.94525.18321.70310.819.48611.94917.15312.38113.15917.562
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted █▅▃▃▁▃▇▆▇▇▆▅▆▇█▅▆▆▆▆▇▇▇▆▇93.7436.766-28.838-29.143-93.103-33.24559.55143.35169.54756.32640.94314.95349.35854.42581.33321.97847.69640.9540.63745.15660.49771.6156.55144.2654.074NANANANANANANANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▅▅▅▅▃▅▅▅▅▅▆▅▆▆▆▆▆▆▆▆▆▆▁███▃██▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇-16.28-15.932-15.569-11.627-33.164-12.921-14.018-15.211-16.316-17.159-10.62-11.766-11.179-10.577-9.738-8.187-6.921-6.777-6.107-5.849-6.38-6.264-44.4496.3196.426.725-33.3136.893.2822.9262.5081.7151.9461.8881.9251.9332.0141.7851.7361.8391.8290.5260.3170.2490.278
us-gaap:OperatingExpenses ▄▃▃▃▃█▅▅▅▅▅▅▅▅▅▄▄▄▃▃▃▃▂▂▃▂▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁333.582254.522270.209234.065246.599526.986368.421364.393383.654360.544349.026366.928362.558345.476352.389305.853315.418302.949267.767256.641240.375227.489217.128222.874229.346221.142264.158236.162234.128245.253208.189199.642212.99220.592197.461188.116189.298201.54173.763174.769179.737165.404141.183144.141140.269
us-gaap:OperatingIncomeLoss █▅▄▃▁▁▇▆▇▇▆▅▆▆▅▅▇▆▆▆▇█▇▆▇▇▅▅▆▆▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅138.85124.602-23.648-33.081-113.252-117.80592.65272.116108.10591.07863.08826.18174.22279.96826.16942.91685.19672.88868.11676.84104.476121.12693.76277.08292.756108.09914.7928.86756.41357.27130.28129.23242.85652.36725.37728.74841.86836.31120.17416.73120.71227.82720.8519.4828.081
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax NANA0.00.051-0.0080.011-0.0120.0170.009-0.006-0.0410.0040.1130.101-0.265-0.117-0.215-0.083-0.0880.2380.043-0.105-0.004-0.0320.2630.00.1760.00.0NANANANANANANANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▄▄▄▃▇▂▄▄▅▅▆▇█▁▁▃▂▃▃▃▄▃▂▄▃▆▆▅▅▄▄▄▄▄▄▄▄▄-0.1260.028-0.21-0.2411.049-0.7220.0690.0330.1860.4710.5661.2461.486-1.119-1.195-0.255-0.798-0.362-0.287-0.318-0.048-0.411-0.693-0.142-0.3620.820.5390.480.1970.008-0.0420.040.0070.052-0.1120.0910.064-0.086NANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▁█-0.1260.028NA-0.2411.049-0.722NA0.0330.1860.471NA1.2461.486NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:Parent-0.126NANA-0.2411.049-0.722NA0.5840.186-0.08NA1.2461.486NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense █▁-0.011-0.393NANA0.698-0.076NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss NA6.869-28.838-29.143-93.103-33.00960.52143.92970.54357.12441.44615.14750.01655.19382.50222.29348.47541.63241.3145.45360.84771.9856.70944.45854.33964.8234.75114.11133.36734.07517.26416.99725.68731.83114.64216.88625.18321.70310.819.486NANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:Parent95.027NANA-29.143-93.103-33.00960.52143.92970.54357.12441.44615.14750.01655.193NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings95.027NA-28.838-29.143-93.103-33.00960.52143.92970.54357.12441.44615.14750.01655.193NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▄▃▂▁▆▇▇█▇▆▆▇▇▄▆▇▆▄▅▆▆▅▅▅▅▄▄▅▅▄▃▄▄▃▃▃▄▃▃▃▃▂▂▂443.747256.695224.84181.916116.52378.911416.977391.222454.779419.977376.258355.1405.572425.444246.817348.769400.614375.837242.119333.481344.851348.615310.89299.956322.102329.241278.95265.029290.541302.524238.471228.874255.846272.959222.838216.864231.166237.851193.937191.5200.449193.231162.033163.621168.35
us-gaap:Revenues █▄▃▂▁▆▇▇█▇▆▆▇▇▆▅▆▆▅▅▅▅▄▄▅▅▄▄▄▄▃▃▃▄▃▃▃▃▂▂▂▂▂▂▂472.433279.124246.561200.984133.347409.181461.073436.509491.759451.622412.114393.109436.78425.444378.558348.769400.614375.837335.883333.481344.851348.615310.89299.956322.102329.241278.95265.029290.541302.524238.471228.874255.846272.959222.838216.864231.166237.851193.937191.5200.449193.231162.033163.621168.35
us-gaap:SellingAndMarketingExpense ▇▄▃▃▃▇█▇██▇▆▇▇▆▅▅▄▁▂▂▂▁▁▂▂▂▃▂17.63211.6098.1867.9678.90918.45519.85317.59120.5420.92619.2916.79818.34819.07815.96713.88412.8619.9983.7535.655.3175.8084.4424.0535.7537.1016.2237.8086.653NANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets █▇▇▇▇▆▆▆▆▆▅▅▅▅▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▁▂▁▁▁▁▁▁▁▁▁▁3874.7063345.23258.9253223.0933272.9693191.9073010.8032834.482982.22750.4772498.6682480.4952325.5052288.9652180.1571965.9721839.9971749.7441671.5761534.8141446.9651404.7951351.6621303.9071317.4811298.9771239.3851269.9041317.329904.242930.191843.869862.552859.253798.194821.081820.721793.242706.743690.052701.978NA501.266NANA
us-gaap:Liabilities ███▇▇▇▆▆▆▆▅▅▅▅▅▄▄▄▃▃▃▃▃▃▃▃▃▃▃▂▂▁▁▁▁▁▁▁▁▁▁2727.5722635.5462559.5622511.3952536.4092382.0042127.2522007.8722177.6912012.0231808.3471827.4991680.8371689.1611632.211492.1461380.5111246.6421197.9541092.5261040.2231042.3341001.657969.829991.3995.389945.32928.671939.305561.373552.874439.709430.248447.047396.47396.744417.731418.527355.239350.946373.643NA203.531NANA
us-gaap:LiabilitiesAndStockholdersEquity █▇▇▇▇▆▆▆▆▆▅▅▅▅▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▁▂▁▁▁▁▁▁▁▁▁▁3874.7063345.23258.9253223.0933272.9693191.9073010.8032834.482982.22750.4772498.6682480.4952325.5052288.9652180.1571965.9721839.9971749.7441671.5761534.8141446.9651404.7951351.6621303.9071317.4811298.9771239.3851269.9041317.329904.242930.191843.869862.552859.253798.194821.081820.721793.242706.743690.052701.978NA501.266NANA
us-gaap:StockholdersEquity █▄▄▄▅▅▆▅▅▅▄▄▄▄▃▂▂▃▂▂▂▂▁▁▁▁▁▁▂▁▂▂▂▂▂▂▂▂▁▁▁1147.134709.654699.363711.698736.56809.903883.551826.608804.509738.454690.321652.996644.668599.804547.947473.826459.486503.102473.622442.288406.742362.461350.005334.078326.181302.443292.877339.999376.729341.442375.743402.375429.593410.922400.461423.14402.99374.715351.504339.106328.335NA297.735NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AssetsCurrent █▅▅▅▅▃▂▂▄▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▂▂▂▂▃▁▁▁▁▂▁▂▂▁▁▁▁1456.919999.688943.633951.203937.487730.797562.221525.427780.247633.946495.248533.916465.293516.805541.275517.974426.914426.147422.054393.429427.901400.515395.243403.477452.895476.783433.627440.313634.461426.923429.921358.773431.188474.677415.267435.921447.029430.762376.361353.141391.945NA219.403NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▇▆▃▅▅▃▃▂█▅▂▃▁▁▂▂▁▂▂▁▂▂▂▂▂▂▂▂▆▂▂▁▂▃▂▃▃▃▃▂▃▃▃▂▃418.448301.615152.764268.042272.21138.361121.88888.114453.852243.28281.52140.75228.98150.77759.44974.02320.0464.73264.71148.718105.683102.13487.11278.54593.471107.10889.6186.197335.26390.11897.71132.98886.379116.60789.557157.123170.981139.548150.7487.338172.204115.916113.293106.322154.12
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents █▆▃▅▅▃▃▂█▅▂▃▁▂▂▂▁▂▂451.39326.827170.319285.468287.642154.032136.785108.589468.17257.77895.911161.06942.23463.14770.63991.35831.46375.98576.358NANANA97.47NANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShortTermInvestments █▄▅▄▃▂▃▂▁767.41426.381532.477441.764390.864314.946335.928314.822216.746NA314.464NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA145.109NA37.0NANA
us-gaap:ReceivablesNetCurrent ▇▇▇▇█▇▂▂▂▂▂▂▂▃▃▁▂▁▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁175.388188.116192.215166.924208.573190.10825.51631.4536.134.20936.01433.67224.18464.34471.05722.7823.91717.32740.66728.17320.04114.34615.14615.71214.00413.46814.21616.50820.45618.65116.85716.58916.91614.61618.63516.56214.30513.80212.8669.044NANA7.852NANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ██▁▆▁32.53732.08824.61630.74224.552NA35.617NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:PropertyPlantAndEquipmentGross ███▇▇██▇▇▆▆▆▅▅▄▅▄▄▃▃▃▂▂▂▂▂▁▁▁2753.4592689.7262648.8572577.9412623.4762713.7532721.3182555.6382446.0182338.232221.2452169.1762068.6471936.3421788.9631855.6141719.3941610.3371561.4651509.5941362.6391335.7491273.3931199.4781173.0111106.8851047.9981026.527954.98NA703.353NANANA558.819NANANA462.225NANANA384.787NANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ████▇▇▇▇▇▆▆▆▆▆▅▇▇▇▇▇▇▆▆▁▁▁▆▁▂636.841617.515598.546573.112547.028503.032484.51452.823426.244397.75373.977352.371321.94300.521276.548523.816506.623489.107466.151443.486425.514405.199387.451-366.656-354.05-331.411309.215-309.469-287.62NA-251.769NANANA-207.615NANANA-154.383NANANA-117.489NANA
us-gaap:PropertyPlantAndEquipmentNet ▇▇▇▇▇██▇▇▇▆▆▆▅▅▄▃▃▃▃▂▂▂▂▂▁▁▁▁2116.6182072.2112050.3112004.8292076.4482210.7212236.8082102.8152019.7741940.481847.2681816.8051746.7071635.8211512.4151331.7981212.7711121.231095.3141066.108937.125930.55885.942832.822818.961775.474738.783717.058667.36NA451.584NANANA351.204NANANA307.842NANANA267.298NANA
us-gaap:OperatingLeaseRightOfUseAsset NANA115.911NANANA22.081NANA23.30.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▄▄▃▄▅▆████▆▅▃▂▂▁▁▁▁▁27.33624.39321.60725.03128.07435.68644.49745.18445.37444.78936.75332.01920.1917.35916.57111.73611.7311.97212.02710.03NANA5.725NANANANANANANANANANANANANANANA5.0537.64410.581NA12.582NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AccountsPayableCurrent ▇▅▄█▆█▄▃▄▄▃▂▄▄▃▃▂▃▂▂▁▂▁▁▂▂▂▂▂▃▂▂▂▂▂▃▃▃▂▅▅57.14337.76734.19764.67451.28662.4627.66721.49332.09728.6927.45217.29927.47329.80120.10819.24718.00225.29516.0111.02110.30611.076.8017.35812.1216.1113.23218.67818.43521.92715.82311.58217.28118.93314.53323.27122.96123.92216.75638.47839.229NA24.759NANA
us-gaap:AccruedLiabilitiesCurrent ▇▅▄▅█▆▆▄▅▅▅▄▅▄▄▃▄▃▄▄▄▃▄▃▃▃▄▂▂▂▃▂▂▂▂▂▂▂▂▁▁182.914129.795116.093130.665225.284154.009161.693121.399147.483136.075122.027110.705124.326119.448105.12784.21110.84285.92796.661106.876109.93491.08109.46271.46384.38983.39110.80260.2652.85851.48887.20342.2645.34243.25536.47636.04541.91346.53634.09617.75618.594NA23.679NANA
us-gaap:ContractWithCustomerLiabilityCurrent █▇▃▄▅▃▁436.728403.049307.508334.061354.735303.835249.95NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ▇▆▅▆▇▆▅▄▅▄▄█▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▂▂▂▂▁▂▂▁▁▁▂▁▁▁838.107742.34689.345776.894859.037743.904612.584549.253607.153595.033513.9961014.432533.123560.872550.18493.848483.066444.34392.898475.876441.192423.135388.468358.139384.327394.019363.168325.961315.404302.963290.651227.925247.517259.962210.546210.34234.038243.785177.505181.349206.197NA166.613NANA
us-gaap:LongTermDebtCurrent ▂▃▃▃▃▃▃▂▃▃▃█▂▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁144.382156.482217.234233.68227.732223.6173.274138.685160.523154.027152.287654.697144.392154.85214.761165.837116.38788.19886.226137.45280.08579.76774.06969.59365.23460.75853.81951.89551.51720.43420.23713.58412.0211.87311.62311.58311.4458.097.885NANANA16.532NANA
us-gaap:OperatingLeaseLiabilityCurrent █▇▇▇▅▃▁▁▁16.9415.24714.31313.81411.1715.9542.6622.3882.24NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent NANA24.651NANANA26.448NANANA16.45NANANA14.906NANANA14.564NANANA6.912NANANA5.941NANANA3.329NANANA0.709NANANA0.313NANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 us-gaap:LiabilitiesNoncurrent us-gaap:ConsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiaryNANA135.683NANANA159.324NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ███▇▇▇▇▇▇▇▆▄▆▅▅▅▄▄▄▃▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁1441.0831459.571441.7771316.1711273.4391264.3891248.5791213.2991338.7341203.7091119.446658.352992.322984.926950.131845.727761.082715.383722.048561.493550.636571.28567.609566.159562.382556.505539.28554.421567.898208.905214.063166.121133.093136.128139.229142.086144.731136.046138.184NANANA11.604NANA
us-gaap:SecuredLongTermDebt ███▇▇▇▆▆▇▆▅▆▅▅▅▄▃▂▂▂▁▁▁▁▁▁▁▁▁1585.4651616.0521659.0111549.8511501.1711487.9891421.8531351.9841499.2571357.7361271.7331313.0491136.7141139.7761164.8921011.564877.469803.581808.274698.945630.721651.047641.678635.752627.616617.263593.099606.316619.415NA234.3179.705145.113148.001150.852153.669156.176144.136146.069NANANA28.136NANA
us-gaap:LongTermDebtAndCapitalLeaseObligations ███▇▆▆▆▆▇▆▅▁▄▄▄1441.0831459.571441.7771316.1711273.4391264.3891248.5791213.2991338.7341203.7091119.446658.352992.322984.926950.131NANANANANANANANANANANANANANANANANANANANANANANANA139.951136.142NA11.604NANA
us-gaap:DeferredTaxLiabilitiesNoncurrent NANA301.763NANANA232.52211.801199.689180.136164.027140.555144.254131.647118.492140.05127.63177.80775.33847.7448.39547.91945.5845.53144.59144.86542.87248.28956.00349.50548.1645.66349.63850.95746.69544.31838.96238.69639.5529.64631.304NA25.314NANA
us-gaap:DeferredIncomeTaxLiabilitiesNet █▇▇▆▆▆▁310.7303.39301.763292.661292.728292.126232.52NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▂▂▂▂█▆▃▃▃▃▁▁▁▁▁▁▁▁▁▁22.92127.14324.38823.805111.20581.58533.56933.51932.11533.14510.87814.1611.13811.71613.40712.5218.7329.1127.677.417NANA0.0NANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent █▇▇▇▆▄▁▁▁▁114.761103.103102.289101.86490.25766.54521.2921.74421.47622.049NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA20.313NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA20.16NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA19.853NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA17.723NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA44.486NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity █▄▄▄▅▅▆▅▅▅▄▄▄▄▃▂▂▃▂▂▂▂▁▁▁▁▁▁▂▁▂▂▂▂▂▂▂▂▁▁▁1147.134709.654699.363711.698736.56809.903883.551826.608804.509738.454690.321652.996644.668599.804547.947473.826459.486503.102473.622442.288406.742362.461350.005334.078326.181302.443292.877339.999376.729341.442375.743402.375429.593410.922400.461423.14402.99374.715351.504339.106328.335NA297.735NANA
us-gaap:CommonStockValue █▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁0.0250.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0230.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.0220.022NA0.021NANA
us-gaap:AdditionalPaidInCapital █▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁671.893333.147329.753315.15310.628295.267289.933285.318280.783276.247270.935266.907263.034259.225253.84251.032246.906243.039238.236234.298232.303230.519228.945229.365222.319224.209221.257220.229215.776214.093209.213208.019205.348202.669201.012195.592192.212189.048187.013185.338183.968NA180.704NANA
us-gaap:RetainedEarningsAccumulatedDeficit ▇▇▇▇▇███▇▇▇▆▆▆▆▅▅▅▅▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▁▂▁▁▁▁▁1117.5181022.4911015.6221044.461073.6021166.5891211.0761161.8931128.8221069.691025.061994.942991.109952.403902.579831.334820.3783.358753.397723.732689.819640.545573.619549.679510.354456.316395.783434.69420.519387.02352.811377.123360.017334.257302.325326.161309.216284.033262.33251.52242.035NA212.932NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▅▆▆▆▆▅▆▆▆▅▅▄▃▁▂▄▄▅▅▆▆▆▇▇██▇▆▆▆▆▆▆▆▆▆▆▅▆▆▆-0.1250.001-0.0270.1830.425-0.6240.0980.029-0.004-0.19-0.661-1.227-2.473-3.959-2.84-1.645-1.391-0.592-0.230.0570.3750.4230.8341.5271.6692.0311.2110.6720.193-0.004-0.0120.03-0.01-0.017-0.0690.043-0.048-0.112-0.026-0.0610.023NA-0.009NANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncomeNANANA0.1830.425-0.6240.0980.029-0.004-0.19-0.661-1.227-2.473-3.959-2.84NANANA-0.23NANANA0.834NANANA1.211NANANA-0.012NANANA-0.069NANANA-0.026NANANANANANA
us-gaap:TreasuryStockValue ████████▇▇▇▇▇▇▇▇▇▆▆▆▆▆▅▅▅▅▄▄▃▃▂▂▁▁▁▁▁▁▁▁▁642.177646.008646.008648.118648.118651.352617.579620.655605.115607.316605.037607.649607.025607.888605.655606.918606.352522.726517.803515.821515.777509.048453.415446.515408.183380.135325.396315.614259.781259.689186.291182.819135.784126.009102.82998.67898.41298.27697.83597.71397.713NA95.913NANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue NA3.394NANANA5.334NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▁▁█▁█▂▂▂▂▂▁▁▁▂3.5043.39414.6034.09914.4095.3344.6154.5354.5365.3124.0283.8733.8095.385NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents us-gaap:Parent3.504NANA4.09914.4095.3344.6154.5354.5365.3124.0283.8733.8095.385NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▁▂▆▅▅▃▅▆▄▂▅▆▄▃▅▆▃▃▄▆▅▃▄▆▄▃▃▅▃▂▃▅▃▂▃▄▃▂▃▄▃▂236.98167.993-42.1030.059170.349106.317120.78343.915117.415160.09766.4896.888110.308172.92794.73733.25116.193146.95138.76851.99495.66160.43997.75736.86567.785162.9674.62747.94639.843107.36546.4569.35133.257107.82447.98112.15133.74882.89230.412-4.77124.58379.68747.453-2.797NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁█▅▇▇▆▅▄▇▆▆▇▆▆▃▆▅▅▆▅▇▆▆▇▆▆▇▄▇▇▇▇▇▇▆▇▇▆█▆█▄▇▇-405.0835.681-156.547-50.546-51.736-106.862-152.457-227.187-37.266-59.553-81.847-28.577-93.198-65.355-252.235-96.761-144.125-125.398-117.834-165.066-52.848-66.089-81.19-26.201-59.942-66.885-46.258-232.457-38.4791.946-32.181-51.529-53.659-55.463-74.333-25.386-16.286-92.82234.283-85.88333.679-190.302-34.859-4.461NA
us-gaap:NetCashProvidedByUsedInFinancingActivities █▃▅▄▄▄▅▁▆▅▃▆▃▂▆▅▃▃▅▄▃▂▄▃▃▂▃▃▇▂▄▃▃▃▃▄▄▄▄▄▄▅▄▃292.663-47.16683.50148.31314.99717.79259.87-176.309130.24361.323-49.8140.524-38.023-115.064142.924117.494-16.76-21.53295.05956.107-39.263-79.328-8.0-25.59-21.48-78.577-24.956-64.555243.781-116.90450.448-11.213-9.826-25.311-41.214-0.62313.971-1.262-1.2935.788-1.974113.238-5.623-40.54NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▁▂▆▅▅▃▅▆▄▂▅▆▄▃▅▆▃▃▄▆▅▃▄▆▄▃▃▅▃▂▃▅▃▂▃▄▃▂▃▄▃▂236.98167.993-42.1030.059170.349106.317120.78343.915117.415160.09766.4896.888110.308172.92794.73733.25116.193146.95138.76851.99495.66160.43997.75736.86567.785162.9674.62747.94639.843107.36546.4569.35133.257107.82447.98112.15133.74882.89230.412-4.77124.58379.68747.453-2.797NA
us-gaap:NetIncomeLoss █▅▃▃▁▃▇▆▇▇▆▅▆▇█▅▆▆▆▆▇▇▇▆▆▇▅▅▆▆▅▅▅▆▅▅▅▅▅▅▅▅▅▅▅95.0276.869-28.838-29.143-93.103-33.00960.52143.92970.54357.12441.44615.14750.01655.19382.50222.29348.47541.63241.3145.45360.84771.9856.70944.45854.33964.8674.79414.17233.49934.22217.47617.10625.7631.93214.76616.94525.18321.70310.819.48611.94917.15312.38113.15917.562
us-gaap:ProfitLoss NA6.869-28.838-29.143-93.103-33.00960.52143.92970.54357.12441.44615.14750.01655.19382.50222.29348.47541.63241.3145.45360.84771.9856.70944.45854.33964.8234.75114.11133.36734.07517.26416.99725.68731.83114.64216.88625.18321.70310.819.486NANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:Parent95.027NANA-29.143-93.103-33.00960.52143.92970.54357.12441.44615.14750.01655.193NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings95.027NA-28.838-29.143-93.103-33.00960.52143.92970.54357.12441.44615.14750.01655.193NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▁█▅▇▇▆▅▄▇▆▆▇▆▆▃▆▅▅▆▅▇▆▆▇▆▆▇▄▇▇▇▇▇▇▆▇▇▆█▆█▄▇▇-405.0835.681-156.547-50.546-51.736-106.862-152.457-227.187-37.266-59.553-81.847-28.577-93.198-65.355-252.235-96.761-144.125-125.398-117.834-165.066-52.848-66.089-81.19-26.201-59.942-66.885-46.258-232.457-38.4791.946-32.181-51.529-53.659-55.463-74.333-25.386-16.286-92.82234.283-85.88333.679-190.302-34.859-4.461NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▃▃▃▂▂▅▆▄▄▄▃▃▄▃█▇▃▂▂▂▂▃▃▂▃▃▄▃▄▁▁▃▃▁▁▂▂▂▁▁▁▂▁▁64.98569.49982.59227.89436.19134.483156.658115.718111.918122.55160.77586.543118.28969.167234.693214.966.21752.62949.42945.13733.48871.68978.7641.43768.36164.12891.28773.14103.92111.0715.95684.51563.94813.09716.24227.74729.46731.62817.61617.7210.71540.53116.26318.942NA
us-gaap:PaymentsToAcquireProductiveAssets NANA106.93825.06611.845164.501173.541115.718111.918122.55166.29186.543118.28969.167NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PaymentsToAcquireProductiveAssets us-gaap:StatementBusinessSegments algt:AllegiantAirNANA106.93825.06611.845118.899133.40998.30898.128108.9250.26574.799106.3659.574NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PaymentsToAcquireProductiveAssets us-gaap:StatementBusinessSegments algt:OtherNANA0.00.00.00.4426.9750.4792.4948.3568.9323.5472.7251.453NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PaymentsToAcquireProductiveAssets us-gaap:StatementBusinessSegments algt:SunseekerResortsNANA0.00.00.045.1633.15716.93111.2965.2757.0948.1979.2048.14NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities █▃▅▄▄▄▅▁▆▅▃▆▃▂▆▅▃▃▅▄▃▂▄▃▃▂▃▃▇▂▄▃▃▃▃▄▄▄▄▄▄▅▄▃292.663-47.16683.50148.31314.99717.79259.87-176.309130.24361.323-49.8140.524-38.023-115.064142.924117.494-16.76-21.53295.05956.107-39.263-79.328-8.0-25.59-21.48-78.577-24.956-64.555243.781-116.90450.448-11.213-9.826-25.311-41.214-0.62313.971-1.262-1.2935.788-1.974113.238-5.623-40.54NA
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▁▂▃▂▂▃▂▁▅█▁▄▁▁▄▃▃▁▄▂▁▁▁▁▁▂▁▁▆▁▂▂1.657105.0155.43996.83647.416128.296104.5010.0276.435494.019.501180.92710.7970.0205.0158.0112.5422.0200.7592.410.028.028.029.026.537.50.00.0385.30.058.048.0NANA0.00.0NANA0.07.0NANA0.0NANA
us-gaap:PaymentsOfDividends NANANA0.0-0.11711.478NA11.40911.41111.394NA11.31411.3111.295NA11.25811.53311.671NA11.5411.57232.783NA5.0954.26548.05NA0.00.041.787NA0.00.00.0NANANANANANANANANANANA
 us-gaap:PaymentsOfDividends us-gaap:StatementEquityComponents us-gaap:ParentNANANA0.00.117-11.478NA11.409-11.411-11.394NA11.314NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PaymentsOfDividends us-gaap:StatementEquityComponents us-gaap:RetainedEarningsNANANA0.00.117-11.478NA11.409-11.411-11.394NA11.314NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock NANA0.00.00.033.7730.0218.549-2.2792.2790.0330.6230.7612.2330.0125.50580.0174.9233.0080.0447.68655.6338.33638.33228.04854.7399.78255.83368.5034.9873.61747.0359.77523.184.1510.2660.1360.4410.1220.01.4930.2450.15240.463NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value25000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.021000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStockValue us-gaap:StatementEquityComponents

us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value25000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.022000.022000.022000.022000.022000.022000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1716161616161616161616161616161616171819
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value161615151616161515151516161616161616171717181819191919191919191920
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value17161615151616161515151516161616161616171717181818191919181818181919
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5.490.42-1.78-1.82-5.85-2.083.722.74.333.522.560.943.13.435.091.392.942.52.492.763.694.293.42.633.193.750.290.81.871.870.960.911.351.660.780.881.311.130.560.50.630.90.660.680.88
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5.490.42-1.78-1.82-5.85-2.083.722.74.333.522.550.943.13.425.081.392.942.52.482.753.684.293.392.623.183.740.270.81.861.860.940.911.341.650.760.871.31.120.560.490.620.890.650.670.87
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value946.897-29.048-29.384-92.054-33.73160437057421651548122474141456071564453655.291433341717253114162521109.403
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.42.70.0-16.2-79.0-8.90.011.215.613.70.04.612.712.70.06.311.911.00.013.517.620.50.014.816.819.91.95.511.611.37.27.410.011.76.57.810.99.10.04.9

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt


Gains
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-02-282019-03-312018-12-312018-09-302018-06-302018-03-31
Value71000.0000-1222000.0000-3700000.0-3677000.00000
Percentage of GainsLossesOnExtinguishmentOfDebt100.00.00.00.0100.00.00.00.0100.0100.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.0-0.30.00.00.00.0-0.90.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1228.67-39.217-44.708-146.416-130.7267856917352146369163478666270981148870861017.679215354272740502326393418141827
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.63.40.0-24.6-125.7-34.50.014.520.217.60.04.115.516.30.010.019.517.60.021.328.432.90.023.626.830.82.88.318.318.011.612.016.018.510.512.417.214.50.07.89.414.1

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value271.801-10.379-15.565-53.313-97.7171812211611-0.7321314-66.07112292420253742312631362.9287.8661920101015188.819.92914127.6285.4066.934108.1526.07210
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.20.70.0-8.6-45.8-25.80.03.34.74.00.0-0.23.23.30.03.67.46.50.07.710.812.30.08.89.911.11.03.06.86.74.44.66.06.84.04.66.35.40.02.83.55.30.03.76.1

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302012-03-31
Value5.011-0.1380.029-49.937-45.3430.0220.071.1131.15-4.49-82.75582-41.3210.0370.803-18.757-0.3740.37430193227253237
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.1-0.10.0-27.5-38.90.00.00.30.3-1.10.023.2-10.20.00.0-5.4-0.10.10.06.09.38.00.010.715.9

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1616111418181920181314131211108.8898.4017.2696.9387.397.23947-6.687-7.017-6.82635-7.097-3.591-3.128-2.754-2.257-2.294-2.188-2.21-2.255-2.2-2.074-1.889-2.255-2.235-0.796-0.522-0.596-0.655
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.50.06.612.14.80.05.04.64.30.04.03.23.00.02.92.22.20.02.12.12.10.0-2.2-2.2-2.112.6-2.7-1.2-1.0-1.2-1.0-0.9-0.8-1.0-1.0-1.0-0.90.0-1.2-1.1-0.40.0-0.4-0.4

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1115101412161520
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.65.95.912.03.24.13.55.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value956.869-28.838-29.143-93.103-33.00960437057411550558222484141456071564454644.7941433341717253114162521109.4861117121317
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.42.70.0-16.0-79.9-8.70.011.215.513.60.04.312.313.00.06.412.111.10.013.617.620.60.014.816.919.71.75.311.511.37.37.510.111.76.67.810.99.10.05.06.08.90.08.010.4

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-03-312020-03-31
Value6.869-33.009
Percentage of NetIncomeLoss100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.7-8.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value936.766-28.838-29.143-93.103-33.24559436956401449548121474040456071564454
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.12.60.0-16.0-79.9-8.80.011.115.313.40.04.212.212.80.06.311.910.90.013.517.520.50.014.816.8

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-16.28-15.932-15.569-11.627-33.164-12.921-14.018-15.211-16.316-17.159-10.62-11.766-11.179-10.577-9.738-8.187-6.921-6.777-6.107-5.849-6.38-6.264-44.4496.3196.426.725-33.3136.893.2822.9262.5081.7151.9461.8881.9251.9332.0141.7851.7361.8391.8290.5260.3170.2490.278
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.7-6.20.0-6.4-28.5-3.40.0-3.9-3.6-4.10.0-3.3-2.8-2.50.0-2.3-1.7-1.80.0-1.8-1.9-1.80.02.12.02.0-11.92.61.11.01.10.70.80.70.90.90.90.80.01.00.90.30.00.20.2

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value333254270234246526368364383360349366362345352305315302267256240227217222229221264236234245208199212220197188189201173174179165141144140
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax75.299.20.0128.7211.6139.10.093.184.485.80.0103.389.481.20.087.778.780.60.077.069.765.30.074.371.267.294.789.180.681.187.387.283.280.888.686.781.984.70.091.389.785.60.088.183.3

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value13824-23.648-33.081-113.252-117.8059272108916326747926428572687610412193779210814285657302942522528413620162027201928
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.39.60.0-18.2-97.2-31.10.018.423.821.70.07.418.318.80.012.321.319.40.023.030.334.70.025.728.832.85.310.919.418.912.712.816.819.211.413.318.115.30.08.710.314.40.011.916.7

us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments

algt:AllegiantAir


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-21.639-28.836-105.3895197771159868297681
Percentage of OperatingIncomeLoss91.587.293.1-43.4105.1107.2106.9108.1108.0113.5102.5102.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-15.9-90.413.50.019.825.423.50.08.418.819.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax algt:AllegiantAir0.0-15.9-90.413.50.019.825.423.50.08.418.80.0

algt:Other


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.971-1.626-0.174-29.689-2.328-3.938-5.746-6.19-3.352-2.41-1.531-1.837
Percentage of OperatingIncomeLoss-4.14.90.225.2-2.5-5.5-5.3-6.8-5.3-9.2-2.1-2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.9-0.1-7.80.0-1.0-1.3-1.50.0-0.7-0.4-0.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax algt:Other0.00.00.00.00.00.00.00.00.00.00.00.0

algt:SunseekerResorts


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-2.98-2.619-7.689-139.235-2.389-1.281-1.695-1.222-1.717-1.136-0.301-0.145
Percentage of OperatingIncomeLoss12.67.96.8118.2-2.6-1.8-1.6-1.3-2.7-4.3-0.4-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-1.4-6.6-36.70.0-0.3-0.4-0.30.0-0.3-0.1-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax algt:SunseekerResorts0.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value051000.0-8000.011000.0-12000.017000.09000.0-6000.0-41000.04000.0113000.0101000.0-265000.0-117000.0-215000.0-83000.0-88000.0238000.043000.0-105000.0-4000.0-32000.0263000.00176000.000
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0-0.00.00.00.00.0-0.00.00.00.00.00.0-0.0-0.1-0.00.00.10.0-0.00.0-0.00.10.00.10.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-126000.028000.0-210000.0-241000.01049000.0-722000.069000.033000.0186000.0471000.0566000.01246000.01486000.0-1119000.0-1195000.0-255000.0-798000.0-362000.0-287000.0-318000.0-48000.0-411000.0-693000.0-142000.0-362000.0820000.0539000.0480000.0197000.08000.0-42000.040000.07000.052000.0-112000.091000.064000.0-86000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.00.0-0.10.9-0.20.00.00.00.10.00.40.4-0.30.0-0.1-0.2-0.10.0-0.1-0.0-0.10.0-0.0-0.10.20.20.20.10.0-0.00.00.00.0-0.10.00.0-0.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-126000.028000.0-241000.01049000.0-722000.033000.0186000.0471000.01246000.01486000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.0-0.10.9-0.20.00.00.10.40.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.0

us-gaap:Parent


Other
Period End2021-06-302020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-126000.0-241000.01049000.0-722000.0584000.0186000.0-80000.01246000.01486000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.01769.7100.0-17.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.10.9-0.20.10.0-0.00.40.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent0.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value-11000.0-393000.0698000.0-76000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.20.6-0.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value6.869-28.838-29.143-93.103-33.00960437057411550558222484141456071564454644.7511433341716253114162521109.486
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.70.0-16.0-79.9-8.70.011.215.513.60.04.312.313.00.06.412.111.10.013.617.620.60.014.816.919.71.75.311.511.37.27.410.011.76.67.810.99.10.05.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:Parent


Profit
Period End2021-06-302020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value95-29.143-93.103-33.0096043705741155055
Percentage of ProfitLoss0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.4-16.0-79.9-8.70.011.215.513.60.04.312.313.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value95-28.838-29.143-93.103-33.0096043705741155055
Percentage of ProfitLoss0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.40.0-16.0-79.9-8.70.011.215.513.60.04.312.313.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value443256224181116378416391454419376355405425246348400375242333344348310299322329278265290302238228255272222216231237193191200193162163168
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

algt:Airrelatedrevenue


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value21312111110065176187187213
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.147.249.455.156.046.744.948.047.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.147.249.455.156.046.744.948.047.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax algt:Airrelatedrevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:CobrandRevenue


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4.6893.6943.5512.192.5464.6864.8333.2133.567
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.41.61.22.21.21.20.80.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.41.61.22.21.21.20.80.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax algt:CobrandRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:ScheduledServiceRevenue


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2251311107948197224200237
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.851.449.043.741.852.153.951.252.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax50.851.449.043.741.852.153.951.252.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax algt:ScheduledServiceRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

algt:AllegiantAir


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value224181116378416391454419376355405
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax algt:AllegiantAir100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value472279246200133409461436491451412393436425378348400375335333344348310299322329278265290302238228255272222216231237193191200193162163168
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax106.5108.7109.7110.5114.4108.0110.6111.6108.1107.5109.5110.7107.7100.0153.4100.0100.0100.0138.7100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling And Marketing Expense

us-gaap:SellingAndMarketingExpense

us-gaap:SellingAndMarketingExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value17118.1867.9678.9091819172020191618191513129.9983.7535.655.3175.8084.4424.0535.7537.1016.2237.8086.653
Percentage of SellingAndMarketingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.04.53.64.47.64.94.84.54.55.05.14.74.54.56.54.03.22.71.61.71.51.71.41.41.82.22.22.92.3

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value38743345325832233272319130102834298227502498248023252288218019651839174916711534144614041351130313171298123912691317904930843862859798821820793706690701501
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Assetsus-gaap:
Period End2020-12-312019-12-31
Value187195
Percentage of Assets5.76.5
Percentage of Assets5.76.5
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0

us-gaap:Assets us-gaap:StatementBusinessSegments

algt:AllegiantAir


Assetsus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-03-31
Value3214317032213132283026892859264024222248
Percentage of Assets98.698.498.498.194.094.995.996.097.098.2
Percentage of Assets98.698.498.498.194.094.995.996.097.098.2
Percentage of Assets algt:AllegiantAir100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:Other


Assetsus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-03-31
Value7.7914152047404141206.715
Percentage of Assets0.20.50.50.71.61.41.41.50.80.3
Percentage of Assets0.20.50.50.71.61.41.41.50.80.3
Percentage of Assets algt:Other100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:SunseekerResorts


Assetsus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-03-31
Value3637353813310480685633
Percentage of Assets1.11.21.11.24.43.72.72.52.21.5
Percentage of Assets1.11.21.11.24.43.72.72.52.21.5
Percentage of Assets algt:SunseekerResorts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value27272635255925112536238221272007217720121808182716801689163214921380124611971092104010421001969991995945928939561552439430447396396417418355350373203
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets70.478.878.577.977.574.670.770.873.073.272.473.772.373.874.975.975.071.271.771.271.974.274.174.475.276.676.373.171.362.159.452.149.952.049.748.350.952.850.350.953.240.6

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value38743345325832233272319130102834298227502498248023252288218019651839174916711534144614041351130313171298123912691317904930843862859798821820793706690701501
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value1147709699711736809883826804738690652644599547473459503473442406362350334326302292339376341375402429410400423402374351339328297292233
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.621.221.522.122.525.429.329.227.026.827.626.327.726.225.124.125.028.828.328.828.125.825.925.624.823.323.626.828.637.840.447.749.847.850.251.549.147.249.749.146.859.40.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value-0.1250.001-0.0270.425-0.6240.098-0.661-2.84-0.026-0.0090.0920.566
Percentage of StockholdersEquity-0.00.0-0.00.1-0.10.0-0.1-0.5-0.0-0.00.00.2
Percentage of Assets-0.00.0-0.00.0-0.00.0-0.0-0.1-0.0-0.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value671333329310295289270253187180171164
Percentage of StockholdersEquity58.646.947.242.236.532.839.246.353.260.758.970.2
Percentage of Assets17.310.010.19.59.39.610.811.626.536.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value0.0230.0230.0230.0230.0220.0210.0210.021
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.0

us-gaap:Parent


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value711736809883826804738690652644599547473350292375400351
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.122.525.429.329.227.026.827.626.327.726.225.128.325.923.640.450.249.7
Percentage of Assets us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value111710221015107311661211102590726221216285
Percentage of StockholdersEquity97.4144.1145.2145.8144.0137.1148.5165.774.671.555.536.7
Percentage of Assets28.830.631.232.836.540.241.041.637.142.50.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value-642.177-646.008646-648.118-651.352617605605-97.835-95.913-42.149-16.713
Percentage of StockholdersEquity-56.0-91.092.4-88.0-80.469.987.6110.5-27.8-32.2-14.4-7.1
Percentage of Assets-16.6-19.319.8-19.8-20.420.524.227.8-13.8-19.10.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1456999943951937730562525780633495533465516541517426426422393427400395403452476433440634426429358431474415435447430376353391219
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.629.929.029.528.622.918.718.526.223.019.821.520.022.624.826.323.224.425.225.629.628.529.230.934.436.735.034.748.247.246.242.550.055.252.053.154.554.353.351.255.843.8

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value4183011522682721381218845324381140285059742064644810510287789310789863359097328611689157170139150871721151131061549097
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.89.04.78.38.34.34.03.115.28.83.35.71.22.22.73.81.13.73.93.27.37.36.46.07.18.27.26.825.510.010.53.910.013.611.219.120.817.621.312.724.50.022.60.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value451326170285287154136108468257951614263709131757697
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.69.85.28.98.84.84.53.815.79.43.86.51.82.83.24.61.74.34.67.2

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312011-06-302010-12-31
Value76742653244139031433531421631414537
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.812.716.313.711.99.911.211.17.312.620.77.4

Receivables Net Current

us-gaap:ReceivablesNetCurrent

us-gaap:ReceivablesNetCurrent


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value1751881921662081902531363436332464712223174028201415151413141620181616161418161413129.0447.852
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.55.65.95.26.46.00.81.11.21.21.41.41.02.83.31.21.31.02.41.81.41.01.11.21.11.01.11.31.62.11.82.02.01.72.32.01.71.71.81.31.6

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value323224302435
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0
Percentage of Assets0.81.00.81.00.81.2

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-312011-12-312010-12-31
Value2753268926482577262327132721255524462338222121692068193617881855171916101561150913621335127311991173110610471026954703558462384
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets71.180.481.380.080.285.090.490.282.085.088.987.489.084.682.194.493.492.093.498.494.295.194.292.089.085.284.680.872.575.670.065.476.8

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-312011-12-312010-12-31
Value636617598573547503484452426397373352321300276523506489466443425405387-366.656-354.05-331.411309-309.469-287.62-251.769-207.615-154.383-117.489
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.418.518.417.816.715.816.116.014.314.515.014.213.813.112.726.627.528.027.928.929.428.828.7-28.1-26.9-25.524.9-24.4-21.8-27.1-26.0-21.8-23.4

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-312011-12-312010-12-31
Value21162072205020042076221022362102201919401847181617461635151213311212112110951066937930885832818775738717667451351307267
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets54.661.962.962.263.469.374.374.267.770.673.973.275.171.569.467.765.964.165.569.564.866.265.563.962.259.759.656.550.748.544.043.653.3

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312019-12-312019-03-312018-12-31
Value11522230.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.00.0
Percentage of Assets3.60.70.80.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312011-12-312011-09-302011-06-302010-12-31
Value27242125283544454544363220171611111112105.7255.0537.6441012
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.70.80.91.11.51.61.51.61.51.30.90.80.80.60.60.70.70.70.40.71.11.52.5

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value573734645162272132282717272920191825161110116.8017.358121613181821151117181423222316383924
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.11.02.01.62.00.90.81.11.01.10.71.21.30.91.01.01.41.00.70.70.80.50.60.91.21.11.51.42.41.71.42.02.21.82.82.83.02.45.65.64.9

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value18212911613022515416112114713612211012411910584110859610610991109718483110605251874245433636414634171823
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.73.93.64.16.94.85.44.34.94.94.94.55.35.24.84.36.04.95.87.07.66.58.15.56.46.48.94.74.05.79.45.05.35.04.64.45.15.94.82.62.64.7

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value436403307334354303249
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.312.09.410.410.89.58.3

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8387426897768597436125496075955131014533560550493483444392475441423388358384394363325315302290227247259210210234243177181206166
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.622.221.224.126.223.320.319.420.421.620.640.922.924.525.225.126.325.423.531.030.530.128.727.529.230.329.325.723.933.531.227.028.730.326.425.628.530.725.126.329.433.2

us-gaap:LiabilitiesCurrent us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilities
Period End2020-12-312019-12-31
Value1717
Percentage of LiabilitiesCurrent2.62.8
Percentage of Assets0.50.6
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary9.48.8

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value144156217233227223173138160154152654144154214165116888613780797469656053515120201312111111118.097.88516
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.74.76.77.37.07.05.84.95.45.66.126.46.26.89.98.46.35.05.29.05.55.75.55.35.04.74.34.13.92.32.21.61.41.41.51.41.41.01.13.3

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value16151413115.9542.6622.3882.24
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.40.40.30.20.10.10.1

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value24261614146.9125.9413.3290.7090.313
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.90.70.70.90.50.50.40.10.0

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesNoncurrent

us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilities
Period End2020-12-312019-12-31
Value135159
Percentage of LiabilitiesNoncurrent100.0100.0
Percentage of Assets4.25.3
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary72.581.4

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value1441145914411316127312641248121313381203111965899298495084576171572256155057156756656255653955456720821416613313613914214413613811
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.243.644.240.838.939.641.542.844.943.844.826.542.743.043.643.041.440.943.236.638.140.742.043.442.742.843.543.743.123.123.019.715.415.817.417.317.617.219.62.3

Secured Long Term Debt

us-gaap:SecuredLongTermDebt

us-gaap:SecuredLongTermDebt


Secured
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value158516161659154915011487142113511499135712711313113611391164101187780380869863065164163562761759360661923417914514815015315614414628
Percentage of SecuredLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets40.948.350.948.145.946.647.247.750.349.450.952.948.949.853.451.547.745.948.445.543.646.347.548.847.647.547.947.747.025.221.316.817.218.918.719.018.220.75.6

us-gaap:SecuredLongTermDebt us-gaap:LongtermDebtType

algt:NonPubliclyHeldDebt


Secured
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1366140815551461141113971329125913031160703742589616719565430356360403334355346
Percentage of SecuredLongTermDebt86.287.293.894.394.093.993.593.186.985.555.356.651.854.161.855.949.144.444.757.753.154.653.9
Percentage of Assets35.342.147.745.443.143.844.244.443.742.228.129.925.327.033.028.823.420.421.626.323.125.325.6
Percentage of Assets algt:NonPubliclyHeldDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-09-302011-06-302010-12-31
Value1441145914411316127312641248121313381203111965899298495013913611
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.243.644.240.838.939.641.542.844.943.844.826.542.743.043.620.319.42.3

Deferred Tax Liabilities Noncurrent

us-gaap:DeferredTaxLiabilitiesNoncurrent

us-gaap:DeferredTaxLiabilitiesNoncurrent


Deferred
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value30123221119918016414014413111814012777754748474545444442485649484549504644383839293125
Percentage of DeferredTaxLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.37.77.56.76.56.65.76.25.85.47.16.94.44.53.13.33.43.43.53.43.53.53.84.35.55.25.45.85.95.95.44.74.95.64.34.55.1

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value310303301292292292232
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.09.19.39.18.99.27.7

us-gaap:DeferredIncomeTaxLiabilitiesNet algt:Deferred

algt:Total


Deferred
Period End2020-12-312019-12-31
Value302232
Percentage of DeferredIncomeTaxLiabilitiesNet100.1100.1
Percentage of Assets9.37.7
Percentage of Assets algt:Total0.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-31
Value2227242311181333332331014111113128.7329.1127.677.4170.0
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.60.80.70.73.42.61.11.21.11.20.40.60.50.50.60.60.50.50.50.50.0

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value114103102101906621212122
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.03.13.13.22.82.10.70.80.70.8

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value20
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.6

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value20
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.6

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value19
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.6

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value17
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.5

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value44
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets1.4

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value1162324232419
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0
Percentage of Assets3.60.80.90.80.90.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value142
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets4.4

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value25
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.8

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value1147709699711736809883826804738690652644599547473459503473442406362350334326302292339376341375402429410400423402374351339328297292233
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets29.621.221.522.122.525.429.329.227.026.827.626.327.726.225.124.125.028.828.328.828.125.825.925.624.823.323.626.828.637.840.447.749.847.850.251.549.147.249.749.146.859.40.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value-0.1250.001-0.0270.425-0.6240.098-0.661-2.84-0.026-0.0090.0920.566
Percentage of StockholdersEquity-0.00.0-0.00.1-0.10.0-0.1-0.5-0.0-0.00.00.2
Percentage of Assets-0.00.0-0.00.0-0.00.0-0.0-0.1-0.0-0.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value671333329310295289270253187180171164
Percentage of StockholdersEquity58.646.947.242.236.532.839.246.353.260.758.970.2
Percentage of Assets17.310.010.19.59.39.610.811.626.536.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value0.0230.0230.0230.0230.0220.0210.0210.021
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.0

us-gaap:Parent


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value711736809883826804738690652644599547473350292375400351
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.122.525.429.329.227.026.827.626.327.726.225.128.325.923.640.450.249.7
Percentage of Assets us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value111710221015107311661211102590726221216285
Percentage of StockholdersEquity97.4144.1145.2145.8144.0137.1148.5165.774.671.555.536.7
Percentage of Assets28.830.631.232.836.540.241.041.637.142.50.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312011-12-312010-12-312009-12-312008-12-31
Value-642.177-646.008646-648.118-651.352617605605-97.835-95.913-42.149-16.713
Percentage of StockholdersEquity-56.0-91.092.4-88.0-80.469.987.6110.5-27.8-32.2-14.4-7.1
Percentage of Assets-16.6-19.319.8-19.8-20.420.524.227.8-13.8-19.10.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value25000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.022000.021000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStockValue us-gaap:StatementEquityComponents

us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value25000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.023000.022000.022000.022000.022000.022000.022000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value671333329315310295289285280276270266263259253251246243238234232230228229222224221220215214209208205202201195192189187185183180
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.310.010.19.89.59.39.610.19.410.010.810.811.311.311.612.813.413.914.315.316.116.416.917.616.917.317.917.316.423.722.524.723.823.625.223.823.423.826.526.926.236.0

us-gaap:AdditionalPaidInCapital us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Additional
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value315310295289285280276270266263259253238228221209201187
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.89.59.39.610.19.410.010.810.811.311.311.614.316.917.922.525.226.5
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value11171022101510441073116612111161112810691025994991952902831820783753723689640573549510456395434420387352377360334302326309284262251242212
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.830.631.232.432.836.540.241.037.938.941.040.142.641.641.442.344.644.845.147.247.745.642.442.238.735.131.934.231.942.837.944.741.738.937.939.737.735.837.136.434.542.5

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Retained
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value10441073116612111161112810691025994991952902753573395352302262
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets32.432.836.540.241.037.938.941.040.142.641.641.445.142.431.937.937.937.1
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value-125000.01000.0-27000.0183000.0425000.0-624000.098000.029000.0-4000.0-190000.0-661000.0-1227000.0-2473000.0-3959000.0-2840000.0-1645000.0-1391000.0-592000.0-230000.057000.0375000.0423000.0834000.01527000.01669000.02031000.01211000.0672000.0193000.0-4000.0-12000.030000.0-10000.0-17000.0-69000.043000.0-48000.0-112000.0-26000.0-61000.023000.0-9000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.00.0-0.00.00.0-0.00.00.0-0.0-0.0-0.0-0.0-0.1-0.2-0.1-0.1-0.1-0.0-0.00.00.00.00.10.10.10.20.10.10.0-0.0-0.00.0-0.0-0.0-0.00.0-0.0-0.0-0.0-0.00.0-0.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Accumulated
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value183000.0425000.0-624000.098000.029000.0-4000.0-190000.0-661000.0-1227000.0-2473000.0-3959000.0-2840000.0-230000.0834000.01211000.0-12000.0-69000.0-26000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.0-0.00.00.0-0.0-0.0-0.0-0.0-0.1-0.2-0.1-0.00.10.1-0.0-0.0-0.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value64264664664864865161762060560760560760760760560660652251751551550945344640838032531525925918618213512610298989897979795
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.619.319.820.119.820.420.521.920.322.124.224.526.126.627.830.933.029.931.033.635.636.233.534.231.029.326.324.919.728.720.021.715.714.712.912.012.012.413.814.213.919.1

us-gaap:TreasuryStockValue us-gaap:StatementEquityComponents

us-gaap:TreasuryStock


Treasury
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value-648.118-648.118-651.352617-620.655-605.115607605-607.649-607.025607-605.65551745332518610297
Percentage of TreasuryStockValue-100.0-100.0-100.0100.0-100.0-100.0100.0100.0-100.0-100.0100.0-100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-20.1-19.8-20.420.5-21.9-20.322.124.2-24.5-26.126.6-27.831.033.526.320.012.913.8
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-03-312020-03-31
Value3.3945.334
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0
Percentage of Assets0.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.5043.394144.099145.3344.6154.5354.5365.3124.0283.8733.8095.385
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue0.0100.00.00.00.0100.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Parent


Adjustments
Period End2021-06-302020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.5044.099145.3344.6154.5354.5365.3124.0283.8733.8095.385
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue0.00.00.0100.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value236167-42.1030.05917010612043117160666.8881101729433116146385195160973667162744739107469.351331074712338230-4.771247947-2.797
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax53.465.4-18.70.0146.228.129.011.225.838.117.71.927.240.638.49.529.039.116.015.627.746.031.412.321.049.526.818.113.735.519.54.113.039.521.55.614.634.915.7-2.512.341.229.3-1.7

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-405.0835-156.547-50.546-51.736-106.862-152.457-227.187-37.266-59.553-81.847-28.577-93.198-65.355-252.235-96.761-144.125-125.398-117.834-165.066-52.848-66.089-81.19-26.201-59.942-66.885-46.258-232.457-38.4791.946-32.181-51.529-53.659-55.463-74.333-25.386-16.286-92.82234-85.88333-190.302-34.859-4.461
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-91.313.9-69.6-27.8-44.4-28.2-36.6-58.1-8.2-14.2-21.8-8.0-23.0-15.4-102.2-27.7-36.0-33.4-48.7-49.5-15.3-19.0-26.1-8.7-18.6-20.3-16.6-87.7-13.20.6-13.5-22.5-21.0-20.3-33.4-11.7-7.0-39.017.7-44.816.8-98.5-21.5-2.7

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value292-47.1668348141759-176.30913061-49.8140-38.023-115.064142117-16.76-21.5329556-39.263-79.328-8.0-25.59-21.48-78.577-24.956-64.555243-116.90450-11.213-9.826-25.311-41.214-0.62313-1.262-1.2935.788-1.974113-5.623-40.54
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax66.0-18.437.126.612.94.714.4-45.128.614.6-13.239.6-9.4-27.057.933.7-4.2-5.739.316.8-11.4-22.8-2.6-8.5-6.7-23.9-8.9-24.483.9-38.621.2-4.9-3.8-9.3-18.5-0.36.0-0.5-0.73.0-1.058.6-3.5-24.8

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value236167-42.1030.05917010612043117160666.8881101729433116146385195160973667162744739107469.351331074712338230-4.771247947-2.797
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax53.465.4-18.70.0146.228.129.011.225.838.117.71.927.240.638.49.529.039.116.015.627.746.031.412.321.049.526.818.113.735.519.54.113.039.521.55.614.634.915.7-2.512.341.229.3-1.7

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value956.869-28.838-29.143-93.103-33.00960437057411550558222484141456071564454644.7941433341717253114162521109.4861117121317
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.42.7-12.8-16.0-79.9-8.714.511.215.513.611.04.312.313.033.46.412.111.117.113.617.620.618.214.816.919.71.75.311.511.37.37.510.111.76.67.810.99.15.65.06.08.97.68.010.4

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-03-312020-03-31
Value6.869-33.009
Percentage of NetIncomeLoss100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.7-8.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value6.869-28.838-29.143-93.103-33.00960437057411550558222484141456071564454644.7511433341716253114162521109.486
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.7-12.8-16.0-79.9-8.714.511.215.513.611.04.312.313.033.46.412.111.117.113.617.620.618.214.816.919.71.75.311.511.37.27.410.011.76.67.810.99.15.65.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:Parent


Profit
Period End2021-06-302020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value95-29.143-93.103-33.0096043705741155055
Percentage of ProfitLoss0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.4-16.0-79.9-8.714.511.215.513.611.04.312.313.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value95-28.838-29.143-93.103-33.0096043705741155055
Percentage of ProfitLoss0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.4-12.8-16.0-79.9-8.714.511.215.513.611.04.312.313.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-405.0835-156.547-50.546-51.736-106.862-152.457-227.187-37.266-59.553-81.847-28.577-93.198-65.355-252.235-96.761-144.125-125.398-117.834-165.066-52.848-66.089-81.19-26.201-59.942-66.885-46.258-232.457-38.4791.946-32.181-51.529-53.659-55.463-74.333-25.386-16.286-92.82234-85.88333-190.302-34.859-4.461
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-91.313.9-69.6-27.8-44.4-28.2-36.6-58.1-8.2-14.2-21.8-8.0-23.0-15.4-102.2-27.7-36.0-33.4-48.7-49.5-15.3-19.0-26.1-8.7-18.6-20.3-16.6-87.7-13.20.6-13.5-22.5-21.0-20.3-33.4-11.7-7.0-39.017.7-44.816.8-98.5-21.5-2.7

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value6469822736134156115111122608611869234214665249453371784168649173103111584631316272931171710401618
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1062511164173115111122668611869
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireProductiveAssets us-gaap:StatementBusinessSegments

algt:AllegiantAir


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value10625111181339898108507410659
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.072.376.985.087.788.975.886.489.986.1

algt:Other


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.00.00.4426.9750.4792.4948.3568.9323.5472.7251.453
Percentage of PaymentsToAcquireProductiveAssets0.00.00.00.34.00.42.26.813.54.12.32.1

algt:SunseekerResorts


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.00.0453316115.2757.0948.1979.2048.14
Percentage of PaymentsToAcquireProductiveAssets0.00.00.027.519.114.610.14.310.79.57.811.8

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value292-47.1668348141759-176.30913061-49.8140-38.023-115.064142117-16.76-21.5329556-39.263-79.328-8.0-25.59-21.48-78.577-24.956-64.555243-116.90450-11.213-9.826-25.311-41.214-0.62313-1.262-1.2935.788-1.974113-5.623-40.54
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax66.0-18.437.126.612.94.714.4-45.128.614.6-13.239.6-9.4-27.057.933.7-4.2-5.739.316.8-11.4-22.8-2.6-8.5-6.7-23.9-8.9-24.483.9-38.621.2-4.9-3.8-9.3-18.5-0.36.0-0.5-0.73.0-1.058.6-3.5-24.8

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302011-12-312011-09-302010-12-31
Value1.65710515596471281040.027649419180100.020515811222200920.028282926370.00.03850.058480.00.00.07.00.0
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.00.00.00.0100.00.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-01-032014-03-312013-09-302013-06-302013-03-31
Value0.0-0.117111111111111111111111111325.0954.265480.00.041410.00.00.0
Percentage of PaymentsOfDividends0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.00.00.00.0

us-gaap:PaymentsOfDividends us-gaap:StatementEquityComponents

us-gaap:Parent


Payments
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value0.00.117-11.47811-11.411-11.39411
Percentage of PaymentsOfDividends0.0-100.0-100.0100.0-100.0-100.0100.0

us-gaap:RetainedEarnings


Payments
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value0.00.117-11.47811-11.411-11.39411
Percentage of PaymentsOfDividends0.0-100.0-100.0100.0-100.0-100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.00.00.0330.0218-2.2792.2790.0330.6230.7612.2330.0125.505804.9233.0080.0447.686558.3363828549.78255684.9873.617479.775234.1510.2660.1360.4410.1220.01.4930.2450.15240
Percentage of PaymentsForRepurchaseOfCommonStock0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value22.520.834.80.3640.74722.80.2310.227
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value2866459.084192213
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312013-12-312012-12-312011-12-31
Value342000.03970000.04175000.0778000.0837000.0512000.0000
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.00.00.00.0

algt:Aircraftscheduledtobeacquired us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

algt:Aircraftscheduledtobeacquired

algt:AirbusA320AircraftSeries, us-gaap:SubsequentEvent


Aircraftscheduledtobeacquiredus-gaap:
Period End2022-03-312020-03-312019-02-152018-02-02
Value1.02.01.02.0
Percentage of Aircraftscheduledtobeacquired100.0100.0100.0100.0

algt:CarryingValueOfAssetHeldForSaleBuilding us-gaap:LongLivedAssetsHeldForSaleByAssetType

algt:CarryingValueOfAssetHeldForSaleBuilding

us-gaap:Building


Carrying
Period End2021-06-302021-03-31
Value04300000.0
Percentage of CarryingValueOfAssetHeldForSaleBuilding0.0100.0

algt:DiscreteIncomeTaxExpenseBenefit

algt:DiscreteIncomeTaxExpenseBenefit


Discrete
Period End2020-09-302020-06-302020-03-31
Value1.30.039
Percentage of DiscreteIncomeTaxExpenseBenefit100.00.0100.0

algt:FixedFeeContractRevenue

algt:FixedFeeContractRevenue


Fixed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5.1347.6929.4255.2843.2378.9192219121017147.65310141111119.2829.1836.7066.87.7544.642.9864.3686.8954.8992.9632.6465.1953.9853.0955.18711129.8159.631129.6769.4712108.9729.903
Percentage of FixedFeeContractRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:FixedFeeContractRevenue us-gaap:StatementBusinessSegments

algt:AllegiantAir


Fixed
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.4255.2843.2378.9192219121017147.65310
Percentage of FixedFeeContractRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:GrantsRecognizedCARESAct

algt:GrantsRecognizedCARESAct


Grants
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-06-30
Value61910.077740.0
Percentage of GrantsRecognizedCARESAct100.0100.00.0100.0100.00.0

algt:NetIncomeLossAvailableToCommonStockholderBasic

algt:NetIncomeLossAvailableToCommonStockholderBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value936.766-28.838-29.143-93.103-33.24559436956401449548121474040456071564454645.091433331716253114162421109.42611
Percentage of NetIncomeLossAvailableToCommonStockholderBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:NonOperatingSpecialCharge us-gaap:StatementBusinessSegments

algt:NonOperatingSpecialCharge

algt:SunseekerResorts


Non
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.0196.8
Percentage of NonOperatingSpecialCharge0.00.0100.0100.0

algt:NonOperatingSpecialChargeTotal

algt:NonOperatingSpecialChargeTotal


Non
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.0196.802
Percentage of NonOperatingSpecialChargeTotal0.00.0100.0100.0

algt:OperatingLeasedAssetsNumberofUnits

algt:OperatingLeasedAssetsNumberofUnits


Operating
Period End2021-06-302021-03-31
Value3.013.0
Percentage of OperatingLeasedAssetsNumberofUnits100.0100.0

algt:OperatingSpecialCharge us-gaap:StatementBusinessSegments

algt:OperatingSpecialCharge

algt:AllegiantAir


Operating
Period End2020-12-312020-09-302020-06-30
Value233275
Percentage of OperatingSpecialCharge100.0100.0100.0

algt:Other


Operating
Period End2020-12-312020-09-302020-06-30
Value-0.7580.968-0.185
Percentage of OperatingSpecialCharge-3.23.0-0.2

algt:SunseekerResorts


Operating
Period End2020-12-312020-09-302020-06-30
Value2.5510.05.452
Percentage of OperatingSpecialCharge10.80.07.2

algt:OperatingSpecialChargeTotal

algt:OperatingSpecialChargeTotal


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.8541.738253381166
Percentage of OperatingSpecialChargeTotal100.0100.0100.0100.0100.0100.0

algt:OtherAircraftRelatedCosts

algt:OtherAircraftRelatedCosts


Other
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.91.28.730
Percentage of OtherAircraftRelatedCosts100.0100.0100.0100.0

algt:OtherOperatingRevenue

algt:OtherOperatingRevenue


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.5511.1151.572.4475.1475.3755.4437.2836.2853.9294.5557.2975.7567.7929.611109.2618.1748.228.3778.3458.0227.6397.878.3978.4788.1187.9882.9680.2740.4081.20.5660.3090.7122.7432.4432.323.1583.5323.3880.371
Percentage of OtherOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:OtherOperatingRevenue us-gaap:StatementBusinessSegments

algt:AllegiantAir


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.002-0.2240.8090.8760.8961.6481.2990.6312.3174.6113.5316.666
Percentage of OtherOperatingRevenue0.1-9.215.716.316.522.620.716.150.963.261.385.5

algt:Other


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.5712.6714.3063.8784.0255.3844.6132.3961.7312.5922.2251.126
Percentage of OtherOperatingRevenue100.1109.283.772.173.973.973.461.038.035.538.714.5

algt:SunseekerResorts


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.0030.00.0320.6210.5220.2510.3730.9020.5070.0940.00.0
Percentage of OtherOperatingRevenue-0.20.00.611.69.63.45.923.011.11.30.00.0

algt:Pointsawarded

algt:Pointsawarded


Pointsawarded
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6.1254.5714.1844.0564.6086.3545.7155.4814.6634.1644.0423.9743.6653.233
Percentage of Pointsawarded100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:Pointsredeemed

algt:Pointsredeemed


Pointsredeemed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4689000.03694000.0-22484000.02278000.02546000.04686000.0-4833000.0-3213000.0-3567000.0-3505000.0-5170000.0-2209000.0-2196000.0-3534000.0
Percentage of Pointsredeemed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:ProceedsFromPayrollSupportProgramLowInterestLoan us-gaap:DebtInstrument, us-gaap:LongtermDebtType

algt:ProceedsFromPayrollSupportProgramLowInterestLoan

algt:PayrollSupportProgramLoanCARESAct, us-gaap:UnsecuredDebt


Proceeds
Period End2020-09-302020-06-30
Value6.716
Percentage of ProceedsFromPayrollSupportProgramLowInterestLoan100.0100.0

algt:ProceedsFromPayrollSupportProgramLowInterestLoan us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

algt:PayrollSupportProgramLoanCARESAct, us-gaap:UnsecuredDebt, us-gaap:SubsequentEvent


Proceeds
Period End2020-07-31
Value5.2
Percentage of ProceedsFromPayrollSupportProgramLowInterestLoan0.0

algt:ProceedsfromGovernmentAssistancePayrollSupportProgramCARESAct

algt:ProceedsfromGovernmentAssistancePayrollSupportProgramCARESAct


Proceedsfrom
Period End2020-09-302020-06-30
Value22154
Percentage of ProceedsfromGovernmentAssistancePayrollSupportProgramCARESAct100.0100.0

algt:ProceedsfromGovernmentAssistancePayrollSupportProgramCARESAct us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Proceedsfrom
Period End2020-07-31
Value17
Percentage of ProceedsfromGovernmentAssistancePayrollSupportProgramCARESAct0.0

algt:ProceedsfromGovernmentAssistancePayrollSupportProgramCARESAct us-gaap:UnusualOrInfrequentItem

algt:PayrollSupportProgram2


Proceedsfrom
Period End2021-03-31
Value45
Percentage of ProceedsfromGovernmentAssistancePayrollSupportProgramCARESAct0.0

algt:SecuritiesExcludedFromComputationOfEarningsPerShareAmounts

algt:SecuritiesExcludedFromComputationOfEarningsPerShareAmounts


Securities
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-03-31
Value-114000.0-26000.0-62000.00-54000.0-33000.0-29000.06000.0-30000.0-38000.0-37000.0-10000.0-8000.0-49000.0-68000.0-5000.0-9000.0-14000.0-29000.0-2000.0-30000.0-21000.0-41000.02000.0-1000.0-40000.0-39000.0-6000.0-4000.0-40000.0-46000.0-1000.0-47000.04000.0-35000.0-7000.0-25000.0-65000.0
Percentage of SecuritiesExcludedFromComputationOfEarningsPerShareAmounts100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:SpecialChargesTotal

algt:SpecialChargesTotal


Special
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.8541.7382533100172
Percentage of SpecialChargesTotal100.0100.0100.0100.0100.0100.0

algt:SpecialChargesTotal us-gaap:StatementBusinessSegments

algt:AllegiantAir


Special
Period End2020-12-312020-09-302020-06-302020-03-31
Value2332759.54
Percentage of SpecialChargesTotal93.097.175.25.5

algt:Other


Special
Period End2020-12-312020-09-302020-06-302020-03-31
Value-0.7580.968-0.18526
Percentage of SpecialChargesTotal-3.02.9-0.215.4

algt:SunseekerResorts


Special
Period End2020-12-312020-09-302020-06-302020-03-31
Value2.5510.025136
Percentage of SpecialChargesTotal10.00.025.079.1

algt:SpecialItemImpairmentcharges

algt:SpecialItemImpairmentcharges


Special
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0.8541.738151001630.00.0
Percentage of SpecialItemImpairmentcharges100.0100.0100.0100.0100.00.00.0

algt:StationOperations

algt:StationOperations


Station
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value574336392740434345383843413734373831273233302726242321212022191920192018191916171616151615
Percentage of StationOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:StockIssuedDuringPeriodSharesStockOptionsSARsExercised us-gaap:StatementEquityComponents

algt:StockIssuedDuringPeriodSharesStockOptionsSARsExercised

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1000.011000.091000.058000.00113000.089000.006000.0118000.09000.00098000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsSARsExercised100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.00.00.0100.0

algt:ThirdPartyProducts

algt:ThirdPartyProducts


Third
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value231310118.44315161818171415171013121412101111118.5149.8910108.2498.0519.657107.2978.64610108.1849.0369.7829.1226.7947.8428.2916.9895.5426.737.152
Percentage of ThirdPartyProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:ThirdPartyProducts us-gaap:StatementBusinessSegments

algt:AllegiantAir


Third
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value10118.443151618181714151710
Percentage of ThirdPartyProducts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:TwoClassMethodWeightedAverageNumberofSharesOutstandingDiluted

algt:TwoClassMethodWeightedAverageNumberofSharesOutstandingDiluted


Two
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value171515-0.0041616160.029151515-0.065151616-0.025161616-0.088161617-0.13-0.14317180.008-0.07719190.01619
Percentage of TwoClassMethodWeightedAverageNumberofSharesOutstandingDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:WeightedAverageNumberOfDilutedSharesOutstandingTreasuryStockMethod

algt:WeightedAverageNumberOfDilutedSharesOutstandingTreasuryStockMethod


Weighted
Period End2021-06-302020-06-30
Value1715
Percentage of WeightedAverageNumberOfDilutedSharesOutstandingTreasuryStockMethod100.0100.0

us-gaap:AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities

us-gaap:AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value9.8668.318-70.2067.7121367-1.8092.1310.2284.9712.7080.5960.1571.081.974
Percentage of AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302020-12-312020-09-302020-06-30
Value105000.00423000.0952000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued100.00.0100.0100.0

us-gaap:Parent


Adjustments
Period End2021-06-302020-09-302020-06-30
Value105000.0423000.0952000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued100.0100.0100.0

us-gaap:AircraftMaintenanceMaterialsAndRepairs

us-gaap:AircraftMaintenanceMaterialsAndRepairs


Aircraft
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value222315141321232420222331241925282830292629262225232122222120161820181918152123212016161614
Percentage of AircraftMaintenanceMaterialsAndRepairs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AircraftRental

us-gaap:AircraftRental


Aircraft
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-312010-09-30
Value5.1174.724.4243.0151.4270.9620.00.00.0220.1010.6710.0750.0210.00.5332.40.1640.00.4720.2190.2330.2340.6950.680.7183.0481.5651.9039.4295.5342.0251.3650.3030.00.00.00.1530.3030.330.1540.489
Percentage of AircraftRental100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0

us-gaap:AssetImpairmentCharges

us-gaap:AssetImpairmentCharges


Asset
Period End2020-12-312020-09-302020-06-302020-03-31
Value-6.80.05.04163
Percentage of AssetImpairmentCharges100.00.0100.0100.0

us-gaap:AssetImpairmentCharges us-gaap:StatementBusinessSegments

algt:AllegiantAir


Asset
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.05.00.0
Percentage of AssetImpairmentCharges-0.00.099.20.0

algt:Other


Asset
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.00.03326
Percentage of AssetImpairmentCharges-0.00.00.716.3

algt:SunseekerResorts


Asset
Period End2020-09-302020-06-302020-03-31
Value0.00.0136
Percentage of AssetImpairmentCharges0.00.083.7

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value1.0244.064-2.394-2.812-24.39446100.0571.7
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value124156-115.149-2.1741331728-359.581210161-65.158118-20.913-7.492-20.71959-44.522-0.373
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0000.70.70.70.70.70.70.70.70.70.70.70.70.70.70.70.70.31.950.30.250.252.5000
Percentage of CommonStockDividendsPerShareDeclared0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:DepreciationAndAmortization

us-gaap:DepreciationAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value44434345434341393836363429282931303029252524242424242322191817171716161513111110109.899.1448.7798.351
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAndAmortization us-gaap:StatementBusinessSegments

algt:AllegiantAir


Depreciation
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value434543424038363536342927
Percentage of DepreciationAndAmortization99.999.999.997.197.197.495.897.498.598.598.698.6

algt:Other


Depreciation
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0-0.0020.00.7720.7690.6981.2780.7970.4940.4730.4180.376
Percentage of DepreciationAndAmortization0.0-0.00.01.81.81.83.32.21.31.41.41.3

algt:SunseekerResorts


Depreciation
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0380.0440.0560.4760.4390.3290.3260.1560.0650.0470.010.007
Percentage of DepreciationAndAmortization0.10.10.11.11.10.80.80.40.20.10.00.0

us-gaap:FuelCosts

us-gaap:FuelCosts


Fuel
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value109825352278810310411999103113122106928085847469605361687969799410410890899710891899410280848679616262
Percentage of FuelCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInContractWithCustomerLiability


Increase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value3395-20.67450530.626-9.19164
Percentage of IncreaseDecreaseInContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value123000.026000.062000.06000.056000.039000.031000.011000.035000.044000.046000.014000.018000.071000.090000.08000.026000.036000.050000.01000.068000.059000.081000.0-13000.099000.0128000.0121000.03000.0165000.0160000.0172000.0-9000.0236000.0250000.0246000.015000.0213000.0200000.0246000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestCostsCapitalizedAdjustment

us-gaap:InterestCostsCapitalizedAdjustment


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0004067000.01028000.0903000.01038000.01503000.0
Percentage of InterestCostsCapitalizedAdjustment0.00.00.0100.0100.0100.0100.0100.0

us-gaap:InterestCostsIncurred

us-gaap:InterestCostsIncurred


Interest
Period End2021-06-302020-06-30
Value1614
Percentage of InterestCostsIncurred100.0100.0

us-gaap:InterestRevenueExpenseNet

us-gaap:InterestRevenueExpenseNet


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value151112111415161310111110
Percentage of InterestRevenueExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRevenueExpenseNet us-gaap:StatementBusinessSegments

algt:AllegiantAir


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value151112111414151310111110
Percentage of InterestRevenueExpenseNet100.0100.0100.195.196.396.797.198.8100.0100.0100.0100.0

algt:SunseekerResorts


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0010.0-0.0150.5760.5510.5070.4780.1580.0020.00.00.0
Percentage of InterestRevenueExpenseNet0.00.0-0.14.93.73.32.91.20.00.00.00.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.50.4630.9130.8681.4172.3112.4853.3353.5023.2012.9672.4251.9271.9071.6151.4541.4751.2640.0781.0280.9380.9662.339-0.301-0.542-0.1051.319-0.106-0.234-0.205-0.237-0.328-0.216-0.262-0.242-0.23-0.267-0.244-0.236-0.338-0.386-0.276-0.188-0.241-0.344
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense

us-gaap:LaborAndRelatedExpense


Labor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1211177495941121091071131191019710111294889296807368695858535847524746393839413332333329292930262826
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityPeriodicPaymentPrincipal us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityPeriodicPaymentPrincipal

algt:SeniorSecuredRevolvingCreditFacilityDomain


Line
Period End2020-09-30
Value11
Percentage of LineOfCreditFacilityPeriodicPaymentPrincipal100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-126000.028000.0-210000.0-292000.01057000.0-733000.081000.016000.0177000.0477000.0-227000.0-83000.0113000.0-956000.0-404000.0230000.0-2000.0225000.0-18000.0-101000.0148000.0291000.0-562000.0-21000.095000.0303000.0-39000.0-125000.032000.08000.0
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherCostAndExpenseOperating


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value15179.05219232627262422252824222424241922231816181417151714121113111110118.5178.5347.4377.2057.007107.2097.9076.978
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherExpenses

us-gaap:OtherExpenses


Other
Period End2021-06-302021-03-312020-12-312020-09-302011-06-302010-06-30
Value0.00.53.11.1108.081
Percentage of OtherExpenses0.0100.0100.0100.0100.0100.0

us-gaap:OtherNonoperatingExpense

us-gaap:OtherNonoperatingExpense


Other
Period End2020-09-302020-06-30
Value552000.0698000.0
Percentage of OtherNonoperatingExpense100.0100.0

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingActivitiesCashFlowStatement


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value3.8221244-7.434-189.508-58.544-5.182-16.136
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherRestructuringCosts

us-gaap:OtherRestructuringCosts


Other
Period End2020-12-312020-09-302020-06-302019-06-30
Value0.00.0190.0
Percentage of OtherRestructuringCosts0.00.0100.00.0

us-gaap:PaymentsForLoans

us-gaap:PaymentsForLoans


Payments
Period End2020-09-30
Value14
Percentage of PaymentsForLoans100.0

us-gaap:PaymentsForLoans us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Payments
Period End2020-10-31
Value4.9
Percentage of PaymentsForLoans0.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-2459000.016000.0-8641000.01056000.0-20000.0-2283000.0-1159000.0-446000.0-3228000.0-6973000.0-6076000.03931000.01989000.0-521000.0-3777000.014000.0-970000.0-382000.0-2791000.0-226000.0288000.0-4061000.0-1386000.0-958000.0142000.0129000.0519000.01080000.0-2588000.0755000.0
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsOfDebtIssuanceCosts


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.0430.6492.6981.6530.3222.530.7411.8330.699300.5190.7380.2330.176
Percentage of PaymentsOfDebtIssuanceCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecurities

us-gaap:PaymentsToAcquireAvailableForSaleSecurities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value584891742141911053826662681089474938930961461529410789841107982482163.2966124285114713451561431513150161
Percentage of PaymentsToAcquireAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PostemploymentBenefitsPeriodExpense

us-gaap:PostemploymentBenefitsPeriodExpense


Postemployment
Period End2020-12-312020-09-30
Value131.8
Percentage of PostemploymentBenefitsPeriodExpense100.0100.0

us-gaap:PostemploymentBenefitsPeriodExpense us-gaap:StatementBusinessSegments

algt:AllegiantAir


Postemployment
Period End2020-12-312020-09-30
Value111.8
Percentage of PostemploymentBenefitsPeriodExpense80.9100.0

algt:SunseekerResorts


Postemployment
Period End2020-12-312020-09-30
Value2.50.0
Percentage of PostemploymentBenefitsPeriodExpense18.40.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2110000.01375000.03234000.003083000.03014000.02205000.0-4894000.02849000.0573000.02736000.01378000.026000.0-593000.0701000.0-513000.0-436000.0-451000.0528000.0-235000.0-3072000.01932000.02214000.0-1686000.0-7639000.04377000.0-372000.0-296000.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value24119482162128130411541331248115610297798574799387889180125887993586679105626195865566826360949.029.05519
Percentage of ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfDebtAndCapitalLeaseObligations

us-gaap:RepaymentsOfDebtAndCapitalLeaseObligations


Repayments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value481514835621471363862939102233826
Percentage of RepaymentsOfDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfLinesOfCredit us-gaap:LongtermDebtType

us-gaap:RepaymentsOfLinesOfCredit

algt:SeniorSecuredRevolvingCreditFacilityDomain


Repayments
Period End2021-03-31
Value46
Percentage of RepaymentsOfLinesOfCredit100.0

us-gaap:RestructuringSettlementAndImpairmentProvisions

us-gaap:RestructuringSettlementAndImpairmentProvisions


Restructuring
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0.8541.7382533811720.00.0
Percentage of RestructuringSettlementAndImpairmentProvisions100.0100.0100.0100.0100.0100.00.00.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value184.733111735500.297-21.1070.023
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:SaleAndLeasebackTransactionGainLossNet

us-gaap:SaleAndLeasebackTransactionGainLossNet


Sale
Period End2020-12-31
Value3.4
Percentage of SaleAndLeasebackTransactionGainLossNet100.0

us-gaap:SaleLeasebackTransactionNetProceedsFinancingActivities

us-gaap:SaleLeasebackTransactionNetProceedsFinancingActivities


Sale
Period End2021-06-302021-03-31
Value0.0105
Percentage of SaleLeasebackTransactionNetProceedsFinancingActivities0.0100.0

us-gaap:SaleLeasebackTransactionNetProceedsInvestingActivities

us-gaap:SaleLeasebackTransactionNetProceedsInvestingActivities


Sale
Period End2020-12-312020-09-302020-06-30
Value9.3953048
Percentage of SaleLeasebackTransactionNetProceedsInvestingActivities100.0100.0100.0

us-gaap:StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants

us-gaap:StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants


Stock
Period End2020-09-302020-06-30
Value400000.01000000.0
Percentage of StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants100.0100.0

us-gaap:StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Stock
Period End2020-07-31
Value300000.0
Percentage of StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants0.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

us-gaap:CommonStock


Stock
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value16000.016000.0041000.019000.0020000.023000.0010000.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans100.0100.00.0100.0100.00.0100.0100.00.0100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302018-09-302018-06-30
Value3350.00.0
Percentage of StockIssuedDuringPeriodSharesNewIssues100.00.00.0

us-gaap:CommonStock


Stock
Period End2021-06-302018-09-302018-06-30
Value0.0020.0030.005
Percentage of StockIssuedDuringPeriodSharesNewIssues0.00.00.0

us-gaap:Parent


Stock
Period End2021-06-302018-09-302018-06-30
Value3350.00.0
Percentage of StockIssuedDuringPeriodSharesNewIssues100.00.00.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementEquityComponents, us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStock, algt:StockOffering


Stock
Period End2021-06-30
Value1.553
Percentage of StockIssuedDuringPeriodSharesNewIssues0.5

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:Parent


Stock
Period End2021-06-302020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value3831000.003234000.03096000.002931000.02645000.0-1000.01624000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.00.0100.0100.00.0100.0100.0100.0100.0

us-gaap:TreasuryStock


Stock
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value3831000.02110000.003234000.03096000.002931000.02645000.0-1000.01624000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.00.00.0100.0100.00.0100.0100.0100.0100.0

us-gaap:TreasuryStockSharesAcquired us-gaap:StatementEquityComponents

us-gaap:TreasuryStockSharesAcquired

us-gaap:CommonStock


Treasury
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value434000.00-434000.0217000.00110000.05000.017000.005000.05000.013000.0
Percentage of TreasuryStockSharesAcquired100.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:Parent


Treasury
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.0-33.77337-15.54-0.732.2797.267-0.624-0.7612.233
Percentage of TreasuryStockValueAcquiredCostMethod0.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock


Treasury
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value670.00.0-33.77337-15.54-0.732.2797.267-0.624-0.7612.233
Percentage of TreasuryStockValueAcquiredCostMethod0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic


Undistributed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1285000.0103000.0-472000.000236000.0-972000.0-578000.0-997000.0-799000.0-504000.0-194000.0-659000.0-768000.0-1170000.0-315000.0-780000.0-682000.0-674000.0-298000.0-283000.0-370000.0-159000.0-199000.0-265000.0-345000.0293000.0-90000.0-239000.0-254000.0
Percentage of UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted


Undistributed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1284000.0103000.0-472000.000236000.0-970000.0-578000.0-996000.0-798000.0-503000.0-194000.0-658000.0-768000.0-1169000.0-315000.0-779000.0-682000.0-673000.0-297000.0-350000.0-370000.0-158000.0-198000.0-265000.0-344000.0292000.00-238000.0-253000.0
Percentage of UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

algt:AdditionalProceedsReceivedFromPayrollSupportProgram us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem

algt:AdditionalProceedsReceivedFromPayrollSupportProgram

us-gaap:SubsequentEvent, algt:PayrollSupportProgram2


Additional
Period End2021-04-23
Value13
Percentage of AdditionalProceedsReceivedFromPayrollSupportProgram100.0

algt:AdditionalProceedsReceivedFromPayrollSupportProgram us-gaap:UnusualOrInfrequentItem

algt:PayrollSupportProgram2


Additional
Period End2021-04-23
Value13
Percentage of AdditionalProceedsReceivedFromPayrollSupportProgram100.0

algt:AirTrafficLiabilityRecognized

algt:AirTrafficLiabilityRecognized


Air
Period End2021-03-312020-12-31
Value70201
Percentage of AirTrafficLiabilityRecognized100.0100.0

algt:AssetsHeldForSaleLongLivedCarryingValue us-gaap:LongLivedAssetsHeldForSaleByAssetType

algt:AssetsHeldForSaleLongLivedCarryingValue

us-gaap:Building


Assets
Period End2020-12-31
Value4800000.0
Percentage of AssetsHeldForSaleLongLivedCarryingValue100.0

algt:ComputerHardwareandSoftware

algt:ComputerHardwareandSoftware


Computer
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value1541511491511471531711581491431401371311241231191131061019692847858
Percentage of ComputerHardwareandSoftware100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:DebtInstrumentAmountNeedToExceedToDisburseNote us-gaap:DebtInstrument, us-gaap:SubsequentEventType

algt:DebtInstrumentAmountNeedToExceedToDisburseNote

algt:PayrollSupportProgramGrantExtension, us-gaap:SubsequentEvent


Debt
Period End2021-01-15
Value100
Percentage of DebtInstrumentAmountNeedToExceedToDisburseNote100.0

algt:DebtInstrumentAmountNeedToExceedToDisburseNote us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem

us-gaap:SubsequentEvent, algt:PayrollSupportProgram3


Debt
Period End2021-04-23
Value100
Percentage of DebtInstrumentAmountNeedToExceedToDisburseNote0.0

algt:DeferredMaintenanceCostsNetNoncurrent

algt:DeferredMaintenanceCostsNetNoncurrent


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value1451311271271311331299989836744363331272817170.0
Percentage of DeferredMaintenanceCostsNetNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

algt:Expendablepartssuppliesandfuelnetofallowance

algt:Expendablepartssuppliesandfuelnetofallowance


Expendablepartssuppliesandfuelnetofallowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312014-09-302013-12-31
Value3026242625282827251919232018172017161616161515161619
Percentage of Expendablepartssuppliesandfuelnetofallowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:Expendablepartssuppliesandfuelreserve

algt:Expendablepartssuppliesandfuelreserve


Expendablepartssuppliesandfuelreserve
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value4.3232.74814137.205
Percentage of Expendablepartssuppliesandfuelreserve100.0100.0100.0100.0100.0

algt:IncreaseInDebtInstrumentForAdditionalInstallment us-gaap:DebtInstrument, us-gaap:SubsequentEventType

algt:IncreaseInDebtInstrumentForAdditionalInstallment

algt:PayrollSupportProgramGrantExtension, us-gaap:SubsequentEvent


Increase
Period End2021-01-15
Value30.0
Percentage of IncreaseInDebtInstrumentForAdditionalInstallment100.0

algt:IncreaseInDebtInstrumentForAdditionalInstallment us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem

us-gaap:SubsequentEvent, algt:PayrollSupportProgram3


Increase
Period End2021-04-23
Value30.0
Percentage of IncreaseInDebtInstrumentForAdditionalInstallment0.0

algt:Landandbuildingsleaseholdimprovements

algt:Landandbuildingsleaseholdimprovements


Landandbuildingsleaseholdimprovements
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value87878786828198868585858877
Percentage of Landandbuildingsleaseholdimprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:MaintenanceAndRepairs

algt:MaintenanceAndRepairs


Maintenance
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1212115.4814.9537.2874.7273.1668.632114.738
Percentage of MaintenanceAndRepairs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:NetOperatingLossCarryback

algt:NetOperatingLossCarryback


Net
Period End2020-12-312019-12-312018-12-31
Value422116185
Percentage of NetOperatingLossCarryback100.0100.0100.0

algt:Operatingrightofuseassetnet

algt:Operatingrightofuseassetnet


Operatingrightofuseassetnet
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1281161151149970222222220.0
Percentage of Operatingrightofuseassetnet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

algt:Passengerfeespayable

algt:Passengerfeespayable


Passengerfeespayable
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value4.686141011119.0078.2195.6384.934
Percentage of Passengerfeespayable100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:PercentOfSecuritiesToBeIssuedBasedOnAmountOfNoteIssued

algt:PercentOfSecuritiesToBeIssuedBasedOnAmountOfNoteIssued


Percent
Period End2021-01-15
Value10.0
Percentage of PercentOfSecuritiesToBeIssuedBasedOnAmountOfNoteIssued100.0

algt:PointsLiability

algt:PointsLiability


Points
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value11101011121211109.88.9108.1108.6028.903
Percentage of PointsLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:ProceedsExpectedFromPayrollSupportProgram us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem

algt:ProceedsExpectedFromPayrollSupportProgram

us-gaap:SubsequentEvent, algt:PayrollSupportProgram3


Proceeds
Period End2021-04-22
Value98
Percentage of ProceedsExpectedFromPayrollSupportProgram100.0

us-gaap:SubsequentEvent, algt:PayrollSupportProgramGrantExtension


Proceeds
Period End2021-03-31
Value91
Percentage of ProceedsExpectedFromPayrollSupportProgram0.0

algt:ProceedsReceivedFromPayrollSupportProgram

algt:ProceedsReceivedFromPayrollSupportProgram


Proceeds
Period End2020-09-30
Value153
Percentage of ProceedsReceivedFromPayrollSupportProgram100.0

algt:ProceedsReceivedFromPayrollSupportProgram us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem

us-gaap:SubsequentEvent, algt:PayrollSupportProgram3


Proceeds
Period End2021-04-23
Value49
Percentage of ProceedsReceivedFromPayrollSupportProgram0.0

us-gaap:SubsequentEvent, algt:PayrollSupportProgramGrantExtension


Proceeds
Period End2021-01-15
Value45
Percentage of ProceedsReceivedFromPayrollSupportProgram0.0

algt:StationExpenses

algt:StationExpenses


Station
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1014121214117.6838.2578.9356.0375.373
Percentage of StationExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:SunseekerResortDevelopment

algt:SunseekerResortDevelopment


Sunseeker
Period End2020-12-312019-12-312018-12-31
Value14150.721
Percentage of SunseekerResortDevelopment100.0100.0100.0

algt:TotalLeaseLiability

algt:TotalLeaseLiability


Total
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value370347243225213186139
Percentage of TotalLeaseLiability100.0100.0100.0100.0100.0100.0100.0

algt:TotalProceedsFromPayrollSupportProgramGrant us-gaap:UnusualOrInfrequentItem

algt:TotalProceedsFromPayrollSupportProgramGrant

algt:PayrollSupportProgram3


Total
Period End2021-06-30
Value98
Percentage of TotalProceedsFromPayrollSupportProgramGrant100.0

algt:TotalProceedsToBeProvidedToUSAirlinesFromPayrollSupportProgramExtension

algt:TotalProceedsToBeProvidedToUSAirlinesFromPayrollSupportProgramExtension


Total
Period End2020-12-27
Value15000
Percentage of TotalProceedsToBeProvidedToUSAirlinesFromPayrollSupportProgramExtension100.0

algt:TotalRightofUseAsset

algt:TotalRightofUseAsset


Total
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value367359249221208180133
Percentage of TotalRightofUseAsset100.0100.0100.0100.0100.0100.0100.0

algt:WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan

algt:WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan


Weighted
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value90.63133.54134.31126.81120.63
Percentage of WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan100.0100.0100.0100.0100.0

dei:EntityCommonStockSharesOutstanding

dei:EntityCommonStockSharesOutstanding


Entity
Period End2021-07-162021-04-262021-02-122020-10-302019-07-15
Value1716161616
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableGrossNoncurrent

us-gaap:AccountsReceivableGrossNoncurrent


Accounts
Period End2020-12-312019-12-312018-12-312017-12-31
Value1011126.3
Percentage of AccountsReceivableGrossNoncurrent100.0100.0100.0100.0

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent


Accrual
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value9.042128.0177.8517.8516.613
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0

us-gaap:AccruedAdvertisingCurrentAndNoncurrent

us-gaap:AccruedAdvertisingCurrentAndNoncurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value890000.03303000.04337000.04154000.0676000.0
Percentage of AccruedAdvertisingCurrentAndNoncurrent100.0100.0100.0100.0100.0

us-gaap:AccumulatedAmortizationOfOtherDeferredCosts

us-gaap:AccumulatedAmortizationOfOtherDeferredCosts


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value5734138.2181.51
Percentage of AccumulatedAmortizationOfOtherDeferredCosts100.0100.0100.0100.0100.0

us-gaap:AirTrafficLiabilityCurrent

us-gaap:AirTrafficLiabilityCurrent


Air
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value307249267267276212231236256204
Percentage of AirTrafficLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesCurrent


Available
Period End2020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value53233528631428434334135235132328826926925524024524628629526927221225425325027228423919920121015419435
Percentage of AvailableForSaleSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedComputerSoftwareNet

us-gaap:CapitalizedComputerSoftwareNet


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4255414140383120168.5242.387
Percentage of CapitalizedComputerSoftwareNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:CashEquivalents, us-gaap:CommercialPaper, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-31
Value214822307.1355.8075.7311108029429.95233273.5940.00.01.199118.426
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:CashEquivalents, us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-31
Value7.407
Percentage of CashAndCashEquivalentsFairValueDisclosure33.8

us-gaap:CashEquivalents, us-gaap:MoneyMarketFunds, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1605.348010747426531012543450.1150.8891.297210.5020.5980.1230.0369.639110.781
Percentage of CashAndCashEquivalentsFairValueDisclosure734.310.9351.7352.8669.6734.51134.4281.2155.3148.5107.31.22.74.6587.40.00.00.00.0803.9103.09.3

us-gaap:CashEquivalents, us-gaap:USGovernmentCorporationsAndAgenciesSecurities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value511.347.9090.00.1240.950.00.00.00.00.0190.0
Percentage of CashAndCashEquivalentsFairValueDisclosure105.15.926.10.02.20.90.00.00.00.00.00.00.0

us-gaap:CashEquivalents, us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-03-312015-12-31
Value593410324.5471.2024.0872.4083.7920.02.0535.3253.1022.7820.01.5684.6391.8430.2561.0240.754
Percentage of CashAndCashEquivalentsFairValueDisclosure271.470.244.8107.363.720.771.32.24.70.04.953.59.310.00.00.00.00.00.09.28.9

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashEquivalents, us-gaap:CommercialPaper, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-31
Value214822307.1355.8075.7311108029429.95233273.5940.00.01.199118.426
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:CashEquivalents, us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-31
Value7.407
Percentage of CashAndCashEquivalentsFairValueDisclosure33.8

us-gaap:CashEquivalents, us-gaap:MoneyMarketFunds, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1605.348010747426531012543450.1150.8891.297210.5020.5980.1230.0369.639110.781
Percentage of CashAndCashEquivalentsFairValueDisclosure734.310.9351.7352.8669.6734.51134.4281.2155.3148.5107.31.22.74.6587.40.00.00.00.0803.9103.09.3

us-gaap:CashEquivalents, us-gaap:USGovernmentCorporationsAndAgenciesSecurities, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value511.347.9090.00.1240.950.00.00.00.00.0190.0
Percentage of CashAndCashEquivalentsFairValueDisclosure105.15.926.10.02.20.90.00.00.00.00.00.00.0

us-gaap:CashEquivalents, us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-03-312015-12-31
Value593410324.5471.2024.0872.4083.7920.02.0535.3253.1022.7820.01.5684.6391.8430.2561.0240.754
Percentage of CashAndCashEquivalentsFairValueDisclosure271.470.244.8107.363.720.771.32.24.70.04.953.59.310.00.00.00.00.00.09.28.9

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashEquivalents, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value1605.348010747426531012543450.1150.8891.297210.5020.5980.1230.0369.639110.781
Percentage of CashAndCashEquivalentsFairValueDisclosure734.310.9351.7352.8669.6734.51134.4281.2155.3148.5107.31.22.74.6587.40.00.00.00.0803.9103.09.3

us-gaap:CashEquivalents, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value881343470117.0099.9421138530441536308.1441.5684.639210.2561.199129.18
Percentage of CashAndCashEquivalentsFairValueDisclosure405.3275.3150.7233.4163.7120.7173.5103.0105.8104.9104.9153.5109.3110.0226.60.00.00.00.0100.0109.2108.9

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashEquivalents, us-gaap:FairValueMeasurementsRecurring


Cash
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value2491391141775949744242107389153731292.075.237210.29210239.961
Percentage of CashAndCashEquivalentsFairValueDisclosure1139.6286.2502.3586.1833.3855.21307.9384.3261.1253.4212.2154.7111.9114.6814.00.00.00.00.0903.9212.2118.2

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:CommercialPaper, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2021-06-302020-12-31
Value6648
Percentage of CashAndCashEquivalentsFairValueDisclosure0.0100.0

us-gaap:MoneyMarketFunds, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2021-06-302020-12-31
Value1575.34
Percentage of CashAndCashEquivalentsFairValueDisclosure0.010.9

us-gaap:USGovernmentCorporationsAndAgenciesSecurities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2020-12-31
Value51
Percentage of CashAndCashEquivalentsFairValueDisclosure105.1

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2021-06-302020-12-31
Value7834
Percentage of CashAndCashEquivalentsFairValueDisclosure0.070.2

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:CommercialPaper, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2021-06-302020-12-31
Value6648
Percentage of CashAndCashEquivalentsFairValueDisclosure0.0100.0

us-gaap:MoneyMarketFunds, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2021-06-302020-12-31
Value1575.34
Percentage of CashAndCashEquivalentsFairValueDisclosure0.010.9

us-gaap:USGovernmentCorporationsAndAgenciesSecurities, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2020-12-31
Value51
Percentage of CashAndCashEquivalentsFairValueDisclosure105.1

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2021-06-302020-12-31
Value7834
Percentage of CashAndCashEquivalentsFairValueDisclosure0.070.2

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2021-06-302020-12-31
Value1575.34
Percentage of CashAndCashEquivalentsFairValueDisclosure0.010.9

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2021-06-302020-12-31
Value145134
Percentage of CashAndCashEquivalentsFairValueDisclosure0.0275.3

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:FairValueMeasurementsRecurring, us-gaap:CashEquivalents


Cash
Period End2021-06-302020-12-31
Value302139
Percentage of CashAndCashEquivalentsFairValueDisclosure0.0286.2

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 us-gaap:SubsequentEventType, us-gaap:UnusualOrInfrequentItem

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1

us-gaap:SubsequentEvent, algt:PayrollSupportProgram2


Class
Period End2020-12-24
Value179.23
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1100.0

us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 us-gaap:UnusualOrInfrequentItem

algt:PayrollSupportProgram2


Class
Period End2020-12-24
Value179.23
Percentage of ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1100.0

us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights

us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights


Class
Period End2020-09-302020-09-292020-06-302020-04-20
Value27681.07981.019700.025889.0
Percentage of ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights100.0100.0100.0100.0

us-gaap:ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Class
Period End2020-07-312020-04-20
Value6189.025898.0
Percentage of ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights0.0100.0

us-gaap:ContractWithCustomerLiability

us-gaap:ContractWithCustomerLiability


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value242221211917151412111011108.6028.9030.79
Percentage of ContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CustomerLoyaltyProgramLiabilityNoncurrent

us-gaap:CustomerLoyaltyProgramLiabilityNoncurrent


Customer
Period End2020-12-312019-12-312018-12-312017-12-31
Value10119.6250.0
Percentage of CustomerLoyaltyProgramLiabilityNoncurrent100.0100.0100.00.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentCarryingAmount

us-gaap:Bonds, us-gaap:SubsequentEvent


Debt
Period End2020-10-07
Value150
Percentage of DebtInstrumentCarryingAmount100.0

us-gaap:DebtInstrumentFaceAmount

us-gaap:DebtInstrumentFaceAmount


Debt
Period End2020-09-302020-04-302020-04-012020-02-132019-06-302019-02-012018-12-31
Value8431315456345075
Percentage of DebtInstrumentFaceAmount100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentFaceAmount us-gaap:LongtermDebtType

algt:SeniorSecuredRevolvingCreditFacilityDomain


Debt
Period End2020-10-31
Value150
Percentage of DebtInstrumentFaceAmount0.0

us-gaap:DebtInstrumentFaceAmount us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Debt
Period End2021-04-232020-04-202020-04-012020-02-132019-02-012018-10-01
Value1.7213154545019
Percentage of DebtInstrumentFaceAmount0.00.0100.0100.0100.00.0

us-gaap:DebtInstrumentFaceAmount us-gaap:UnusualOrInfrequentItem

algt:PayrollSupportProgram2


Debt
Period End2021-04-23
Value1.7
Percentage of DebtInstrumentFaceAmount0.0

us-gaap:DeferredFinanceCostsCurrentGross

us-gaap:DeferredFinanceCostsCurrentGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value7527000.05694000.01443000.02298000.01868000.0
Percentage of DeferredFinanceCostsCurrentGross100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredFinanceCostsNet


Deferred
Period End2020-12-312019-12-312018-12-31
Value23235.0
Percentage of DeferredFinanceCostsNet100.0100.0100.0

us-gaap:DeferredFinanceCostsNoncurrentGross

us-gaap:DeferredFinanceCostsNoncurrentGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value15173.5913.8123.035
Percentage of DeferredFinanceCostsNoncurrentGross100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxLiabilities algt:DeferredNoncurrent

us-gaap:DeferredIncomeTaxLiabilities

algt:TotalNoncurrent


Deferred
Period End2020-12-312019-12-31
Value331299
Percentage of DeferredIncomeTaxLiabilities100.0100.0

us-gaap:DeferredTaxAssetsGross algt:DeferredNoncurrent

us-gaap:DeferredTaxAssetsGross

algt:AccruedPropertyTaxes


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1.1111.7421.6151.5732.0771.1491.329
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0

algt:AccruedVacation


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1.0240.9070.5950.691.1831.3391.149
Percentage of DeferredTaxAssetsGross92.252.136.843.957.0116.586.5

algt:StockBasedCompensation


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1.0251.4151.311.9833.1262.9232.936
Percentage of DeferredTaxAssetsGross92.381.281.1126.1150.5254.4220.9

us-gaap:ValuationAllowanceOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1558380.6350.00.01.063
Percentage of DeferredTaxAssetsGross1438.33333.32407.140.40.00.080.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312014-12-31
Value5200000.05700000.0
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic


Deferred
Period End2020-12-31
Value8500000.0
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsDomestic100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal


Deferred
Period End2020-12-31
Value7400000.0
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-31
Value2014
Percentage of DeferredTaxLiabilitiesOther100.0100.0

us-gaap:DeferredTaxLiabilitiesOther algt:DeferredNoncurrent

algt:Depreciation


Deferred
Period End2020-12-312019-12-31
Value308278
Percentage of DeferredTaxLiabilitiesOther1522.91918.2

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses algt:DeferredNoncurrent

us-gaap:DeferredTaxLiabilitiesPrepaidExpenses

algt:PrepaidExpenses


Deferred
Period End2020-12-312019-12-31
Value2517000.06211000.0
Percentage of DeferredTaxLiabilitiesPrepaidExpenses100.0100.0

us-gaap:DividendsPayableAmountPerShare

us-gaap:DividendsPayableAmountPerShare


Dividends
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312015-03-312014-12-312013-12-31
Value0.72.82.82.82.41.10.252.52.25
Percentage of DividendsPayableAmountPerShare100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value21443435383730231111
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized


Employee
Period End2020-12-31
Value27
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiability


Finance
Period End2020-12-31
Value126
Percentage of FinanceLeaseLiability100.0

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityCurrent


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value13139.7677.9227.8367.757.6667.5827.499
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityNoncurrent


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value225215117101103105107109111
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDue


Finance
Period End2020-12-31
Value159
Percentage of FinanceLeaseLiabilityPaymentsDue100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive


Finance
Period End2020-12-31
Value82
Percentage of FinanceLeaseLiabilityPaymentsDueAfterYearFive100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths


Finance
Period End2020-12-31
Value15
Percentage of FinanceLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive


Finance
Period End2020-12-31
Value10
Percentage of FinanceLeaseLiabilityPaymentsDueYearFive100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour


Finance
Period End2020-12-31
Value10
Percentage of FinanceLeaseLiabilityPaymentsDueYearFour100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree


Finance
Period End2020-12-31
Value26
Percentage of FinanceLeaseLiabilityPaymentsDueYearThree100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo


Finance
Period End2020-12-31
Value14
Percentage of FinanceLeaseLiabilityPaymentsDueYearTwo100.0

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount


Finance
Period End2020-12-31
Value32
Percentage of FinanceLeaseLiabilityUndiscountedExcessAmount100.0

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseRightOfUseAsset


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value239242133106108110111
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent


Finance
Period End2020-12-312019-12-31
Value5.04.4
Percentage of FinanceLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:FlightEquipmentGross

us-gaap:FlightEquipmentGross


Flight
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312012-12-312011-12-312010-12-31
Value2429237023312259231223972289216820892002190518671785166815391634151814181377133511951177112310571047989947936870629515431364
Percentage of FlightEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority

us-gaap:IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority


Income
Period End2020-12-312019-12-312018-12-312017-12-31
Value132000.0530000.0-3464000.01587000.0
Percentage of IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority100.0100.0100.0100.0

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


Interest
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value6.566.5141413117.98.8750.7230.5220.501
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryValuationReserves

us-gaap:InventoryValuationReserves


Inventory
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4.32.714137.24.63.7833.3973.0032.6582.3151.9971.7021.4151.2351.0550.8750.6950.5750.4850.3950.3050.260.17
Percentage of InventoryValuationReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value20
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

algt:SeniorSecuredRevolvingCreditFacilityDomain


Line
Period End2020-12-312020-09-30
Value5369
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312011-09-302011-06-302010-12-31
Value1441562172332272231731381601541526541441542147.8936.19516
Percentage of LongTermDebtAndCapitalLeaseObligationsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType

us-gaap:LongTermDebtFairValue

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, algt:NonPubliclyHeldDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value117011971191134912941235114010531098937619663526555660526402336340378314332327
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value357345272362
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-12-31
Value217
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value858489656
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value802801806122
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value132131136135
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2021-06-302021-03-312020-12-312020-09-30
Value131131137229
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear


Long
Period End2021-06-302021-03-312020-09-30
Value7512044
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear100.0100.0100.0

us-gaap:LongtermDebtWeightedAverageInterestRate us-gaap:DebtInstrument

us-gaap:LongtermDebtWeightedAverageInterestRate

algt:FixedRate


Longterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value5.75.85.73.90.0320.0380.0370.0390.0470.0390.0530.0530.0540.0540.05410.05410.0541
Percentage of LongtermDebtWeightedAverageInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:VariableRate


Longterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value2.52.52.42.40.0260.0370.0450.0480.0510.0550.0420.040.040.0380.03310.03250.0316
Percentage of LongtermDebtWeightedAverageInterestRate43.943.142.161.581.297.4121.6123.1108.5141.079.275.574.170.461.260.158.4

us-gaap:NotesPayable us-gaap:DebtInstrument

us-gaap:NotesPayable

algt:FixedRate


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value621619525363273230235215321325640465
Percentage of NotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

algt:VariableRate


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value96399611331186122812571186113611771032630699
Percentage of NotesPayable155.0160.7215.9326.9449.6545.5504.9526.4366.1317.398.5150.3

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-312019-12-31
Value5.44.3
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0

us-gaap:PropertyPlantAndEquipmentOther

us-gaap:PropertyPlantAndEquipmentOther


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value828080808180161142121106897515114212510181
Percentage of PropertyPlantAndEquipmentOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentOwnedAccumulatedDepreciation

us-gaap:PropertyPlantAndEquipmentOwnedAccumulatedDepreciation


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value598484373276466
Percentage of PropertyPlantAndEquipmentOwnedAccumulatedDepreciation100.0100.0100.0100.0100.0

us-gaap:PurchaseObligation

us-gaap:PurchaseObligation


Purchase
Period End2020-12-31
Value86
Percentage of PurchaseObligation100.0

us-gaap:PurchaseObligationDueInNextTwelveMonths

us-gaap:PurchaseObligationDueInNextTwelveMonths


Purchase
Period End2020-12-31
Value65
Percentage of PurchaseObligationDueInNextTwelveMonths100.0

us-gaap:PurchaseObligationDueInSecondYear

us-gaap:PurchaseObligationDueInSecondYear


Purchase
Period End2020-12-31
Value21
Percentage of PurchaseObligationDueInSecondYear100.0

us-gaap:RestrictedCash

us-gaap:RestrictedCash


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value322517171515142014141420131211171111
Percentage of RestrictedCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value142.25147.25153.88153.32146.01155.391.1562.6152.6347.2249.6
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary


Unrecorded
Period End2020-09-30
Value37
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary


Unrecorded
Period End2020-09-30
Value21
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount

us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount


Unrecorded
Period End2020-09-30
Value169
Percentage of UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount100.0

us-gaap:UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear

us-gaap:UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear


Unrecorded
Period End2020-09-30
Value110
Percentage of UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear100.0

us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:ValuationAllowancesAndReservesBalance


Valuation
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value4.3232.74814137.2054.6073.0031.702
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:OperatingIncomeLoss
us-gaap:StatementBusinessSegments
(None,)
Operating Income Lossus-gaap: Statement Business Segments
us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
(None,)
Other Comprehensive Income Loss Net Of Taxus-gaap: Statement Equity Components
us-gaap:ProfitLoss
us-gaap:StatementEquityComponents
(None,)
Profit Lossus-gaap: Statement Equity Components
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:Assets
us-gaap:StatementBusinessSegments
(None,)
Assetsus-gaap: Statement Business Segments
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents
(None,)
Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Valueus-gaap: Statement Equity Components
us-gaap:ProfitLoss
us-gaap:StatementEquityComponents
(None,)
Profit Lossus-gaap: Statement Equity Components
us-gaap:PaymentsToAcquireProductiveAssets
us-gaap:StatementBusinessSegments
(None,)
Payments To Acquire Productive Assetsus-gaap: Statement Business Segments
us-gaap:PaymentsOfDividends
us-gaap:StatementEquityComponents
(None,)
Payments Of Dividendsus-gaap: Statement Equity Components