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Property and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]        
Flight equipment, including pre-delivery deposits   $ 2,474,650   $ 2,331,499
Computer hardware and software   157,334   149,727
Land and buildings/leasehold improvements (1)   87,657   87,030
Other property and equipment   97,965   80,601
Total property and equipment   2,817,606   2,648,857
Less accumulated depreciation and amortization   669,618   598,546
Property and equipment, net   2,147,988   $ 2,050,311
Capital Expenditures Incurred but Not yet Paid $ 16,900 12,727 $ 19,294  
Building        
Property, Plant and Equipment [Line Items]        
Carrying Value of Asset Held for Sale, Building   $ 4,300