Loss (Gain) on Disposal of Assets (Details)			1 Months Ended	2 Months Ended	3 Months Ended				10 Months Ended	12 Months Ended
	Mar. 13, 2025 aircraft	Oct. 29, 2024 aircraft	Dec. 31, 2023 USD ($) aircraftLeasebackTransaction	Mar. 12, 2025 USD ($) aircraftLeasebackTransaction	Sep. 30, 2025 USD ($) aircraftLeasebackTransaction	Jun. 30, 2025 USD ($) aircraftLeasebackTransaction	Dec. 31, 2024 USD ($) aircraft aircraftLeasebackTransaction	Mar. 31, 2024 aircraftLeasebackTransaction	Dec. 31, 2025 USD ($) aircraft aircraftLeasebackTransaction	Dec. 31, 2024 USD ($) aircraft aircraftLeasebackTransaction aircraft_engine	Dec. 31, 2023 USD ($) aircraft aircraftLeasebackTransaction aircraftEngine
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets				$ (11,655,000)					$ 109,096,000	$ (273,871,000)	$ (33,966,000)
Gain (loss) on sale-leaseback transaction			$ (32,100,000)							(273,900,000)
Fixed asset impairment charges									$ 8,700,000	$ 0	0
Failed aircraft sale leaseback | aircraftLeasebackTransaction							18		13	18
Number of engines sold | aircraft_engine										38
A319 Airframes And Engines
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets										$ (11,900,000)
A320 and A321
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fixed asset impairment charges							$ 18,500,000			282,500,000
Number of aircraft to be sold | aircraft		23					23
Airbus A319
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets										$ 900,000	$ (1,600,000)
Number of aircraft sold | aircraft										17	12
Number of engines sold | aircraftEngine											20
Aircraft Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets					$ 3,200,000				$ 3,200,000
Obsolete Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets				(400,000)					(2,900,000)	$ (2,500,000)	$ (3,300,000)
G.A. Telesis
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets									$ (2,000,000.0)
Number of aircraft sold | aircraft									1
Number of aircraft to be sold | aircraft	21
GAT
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets										$ (400,000)
Number of aircraft sold | aircraft										2
Aircraft Leaseback Transaction, New Aircraft Deliveries
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets						$ 1,800,000				$ 25,100,000
Gain (loss) on sale-leaseback transaction				$ 6,400,000	$ 117,700,000						$ 3,000,000.0
Number of aircraft related to loss | aircraftLeasebackTransaction				2	14
Number of sale-leaseback transactions | aircraftLeasebackTransaction						1				8
Number of aircraft related to loss | aircraftLeasebackTransaction											10
Aircraft Leaseback Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets										$ (1,700,000)
Number of sale-leaseback transactions | aircraftLeasebackTransaction			20					5		5
Number of aircraft on leases | aircraftLeasebackTransaction			6					2		2
Failed aircraft sale leaseback | aircraftLeasebackTransaction			14					3			14