Summary of Significant Accounting Policies - Airframe and Engine Maintenance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Deferred costs for heavy maintenance	$ 149,300	$ 74,100	$ 75,200
Deferred heavy maintenance, gross	349,000	633,900
Accumulated heavy maintenance amortization	1,098,819	884,858
Airframe and Engine Maintenance Costs [Abstract]
Total maintenance, materials and repairs	187,820	159,502	111,227
Utilization-Based Maintenance Expense
Airframe and Engine Maintenance Costs [Abstract]
Total maintenance, materials and repairs	97,930	81,591	52,092
Non-Utilization-Based Maintenance Expense
Airframe and Engine Maintenance Costs [Abstract]
Total maintenance, materials and repairs	89,890	77,911	59,135
Heavy maintenance and major overhaul
Property, Plant and Equipment [Line Items]
Amortization of heavy maintenance	96,707	91,929	$ 88,927
Heavy Maintenance
Property, Plant and Equipment [Line Items]
Accumulated heavy maintenance amortization	158,600	$ 303,900
Aircraft | Airbus A319
Property, Plant and Equipment [Line Items]
Accelerated retirement of aircraft, amount written off	$ 192,300