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Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Flight equipment, including pre-delivery deposits	$ 2,370,269		$ 2,331,499
Computer hardware and software	151,755		149,727
Land and buildings/leasehold improvements (1)	87,030		87,030
Other property and equipment	80,672		80,601
Total property and equipment	2,689,726		2,648,857
Less accumulated depreciation and amortization	617,515		598,546
Property and equipment, net	2,072,211		2,050,311
Capital Expenditures Incurred but Not yet Paid	4,064	$ 46,452	$ 16,900
Building
Property, Plant and Equipment [Line Items]
Carrying Value of Asset Held for Sale, Building	$ 4,300

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Carrying Value of Asset Held for Sale, Building

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Computer Hardware and Software

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Land and buildings/leasehold improvements

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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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The gross amount of long-lived, depreciable flight assets used in the entity's principle business operations, including owned aircraft and on capital lease, as well as capitalized improvements.

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