Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 4,458,186	$ 4,062,042
Accumulated depreciation	(1,779,206)	(1,659,634)
Property and equipment, net	2,678,980	2,402,408
Flight equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	3,663,728	3,506,134
Ground equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	71,597	70,092
Leasehold improvements, facilities and office equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	41,917	40,183
Aircraft modifications and projects in progress
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 680,944	$ 445,633