Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	$ (130,000)	$ (107,000)
Total property and equipment, net	186,000	176,000
Flight equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	212,000	182,000
Ground and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 104,000	$ 101,000