Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 4,618,263	$ 4,062,042
Accumulated depreciation	(1,797,494)	(1,659,634)
Property and equipment, net	2,820,769	2,402,408
Flight equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	3,865,049	3,506,134
Ground equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	72,463	70,092
Leasehold improvements, facilities and office equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	42,120	40,183
Aircraft modifications and projects in progress
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 638,631	$ 445,633