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Property and Equipment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Aircraft	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Abstract]
Flight Equipment, Gross	$ 2,576,315	$ 2,331,499
Computer Hardware and Software	160,459	149,727
Land and buildings/leasehold improvements	86,036	87,030
Property, Plant and Equipment, Other, Gross	132,875	80,601
Property, Plant and Equipment, Gross, Total	2,955,685	2,648,857
Less accumulated depreciation and amortization	(696,178)	(598,546)
Property, Plant and Equipment, Net	2,259,507	2,050,311
Capital Expenditures Incurred but Not yet Paid	$ 17,700	$ 16,900
Capital Addition Purchase Commitments | Airbus A320 Aircraft Series
Property, Plant and Equipment [Line Items]
Number of Aircraft Committed To Purchase | Aircraft	51

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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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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