Summary of Significant Accounting Policies - Property and Equipment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) aircraftEngine aircraft aircraft_engine flightSimulator	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Number of spare engines capitalized | aircraft_engine	28
Number of flight simulators capitalized | flightSimulator	3
Depreciation, Depletion and Amortization, Nonproduction [Abstract]
Depreciation	$ 218,106	$ 199,118	$ 193,079
Amortization of capitalized software	22,998	17,265	12,203
Total depreciation and amortization	$ 320,872	313,090	297,211
Spare engines
Property, Plant and Equipment [Line Items]
Number of aircraft under operating lease | aircraft_engine	6
A320 Family | Aircraft
Property, Plant and Equipment [Line Items]
Number of aircraft under operating lease | aircraft	117
Minimum | Aircraft
Property, Plant and Equipment [Line Items]
Operating lease contract term	4 years
Maximum | Aircraft
Property, Plant and Equipment [Line Items]
Operating lease contract term	18 years
Aircrafts, Major Spare Rotable Parts, Avionics, and Assemblies
Property, Plant and Equipment [Line Items]
Residual value, percentage	10.00%
Aircraft, engines and flight simulators
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	25 years
Spare rotables and flight assemblies | Minimum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	7 years
Spare rotables and flight assemblies | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	25 years
Other equipment and vehicles | Minimum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	5 years
Other equipment and vehicles | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	7 years
Internal use software
Depreciation, Depletion and Amortization, Nonproduction [Abstract]
Capitalized computer software, net	$ 53,600	41,100
Capitalized software costs during the year	$ 35,500	25,700	20,500
Internal use software | Minimum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	3 years
Internal use software | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	10 years
Buildings
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	30 years
Aircraft | A320 Family
Property, Plant and Equipment [Line Items]
Number of aircraft capitalized | aircraftEngine	88
Aircraft | Minimum
Property, Plant and Equipment [Line Items]
Finance lease contract term	4 years
Aircraft | Maximum
Property, Plant and Equipment [Line Items]
Finance lease contract term	18 years
Spare engines | Minimum
Property, Plant and Equipment [Line Items]
Operating lease contract term	12 years
Spare engines | Maximum
Property, Plant and Equipment [Line Items]
Operating lease contract term	18 years
Heavy maintenance and major overhaul
Depreciation, Depletion and Amortization, Nonproduction [Abstract]
Amortization of heavy maintenance	$ 79,768	$ 96,707	$ 91,929