Loss on Disposal of Assets (Details) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) aircraft aircraftLeasebackTransaction	Jan. 31, 2023	Mar. 31, 2022 USD ($) aircraft_engine	Dec. 31, 2023 USD ($) aircraftLeasebackTransaction aircraft aircraft_engine	Dec. 31, 2022 USD ($) aircraft aircraftLeasebackTransaction	Dec. 31, 2021 USD ($) aircraftLeasebackTransaction	Dec. 31, 2023 aircraft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of assets	$ (32,100)			$ 33,966	$ 46,624	$ 3,320
Loss on sale-leaseback transaction				$ 3,000	$ 38,500	$ 2,300
Number of aircraft related to loss | aircraftLeasebackTransaction				10	16	5
Repurchase agreement for the sale of aircraft, term		2 years
Number of aircraft sold | aircraft				12
Number of engines sold | aircraft_engine				20
Impairment of long-lived assets to be disposed of			$ 6,600
Number of impaired spare engine related to loss on disposal | aircraft_engine			1
Aircraft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Failed aircraft sale leaseback	15			15			15
Obsolete Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of obsolete assets				$ 3,300
Auxiliary Power Units
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of assets						$ (1,100)
Airbus A319
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of assets				$ (1,600)
Airbus A319 | Aircraft | Impairment due to Planned Acceleration of Plane Retirement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of aircraft, accelerated retirement | aircraft					29
Aircraft Leaseback Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional sale-leaseback transaction | aircraft	20
Number of aircraft on leases | aircraft	6
Failed aircraft sale leaseback | aircraft							14