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Property and Equipment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Aircraft	Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Flight Equipment, Gross	$ 2,331,499	$ 2,289,157
Computer Hardware and Software	149,727	171,516
Land and buildings/leasehold improvements	87,030	98,885
Property, Plant and Equipment, Other, Gross	80,601	161,760
Property, Plant and Equipment, Gross	2,648,857	2,721,318
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(598,546)	(484,510)
Property, Plant and Equipment, Net	2,050,311	2,236,808
Capital Expenditures Incurred but Not yet Paid	16,900	$ 16,500
Building
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Long Lived, Carrying Value	$ 4,800
Capital Addition Purchase Commitments | Airbus A320 Aircraft Series
Property, Plant and Equipment [Line Items]
Number Of Aircraft Committed To Purchase | Aircraft	3

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Assets Held-for-sale, Long Lived, Carrying Value

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Computer Hardware and Software

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Land and buildings/leasehold improvements

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Number Of Aircraft Committed To Purchase

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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