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Property and Equipment (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Flight equipment, including pre-delivery deposits	$ 2,259,358		$ 2,289,157
Computer hardware and software	151,602		171,516
Land and buildings/leasehold improvements	86,825		98,885
Other property and equipment	80,156		161,760
Total property and equipment	2,577,941		2,721,318
Less accumulated depreciation and amortization	573,112		484,510
Property and equipment, net	2,004,829		2,236,808
Capital Expenditures Incurred but Not yet Paid	$ 19,294	$ 6,091	$ 16,500

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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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