Loss (Gain) on Disposal (Details) $ in Thousands	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Mar. 12, 2025 USD ($) aircraftLeasebackTransaction	Sep. 30, 2025 USD ($) aircraft aircraftLeasebackTransaction	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) aircraftLeasebackTransaction	Sep. 30, 2024 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets	$ (11,655)	$ 113,713	$ (3,191)	$ 114,041	$ 13,885
Fixed asset impairment charges		2,700		4,400
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)
Number of aircraft sold | aircraft		1
A320 and A321
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fixed asset impairment charges	18,500
Airbus A319
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets	900
Obsolete Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of assets	(400)
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
Gain on sale-leaseback transaction	$ 6,400	$ 117,700
Number of aircraft related to loss | aircraftLeasebackTransaction	2	14
Number of sale-leaseback transactions | aircraftLeasebackTransaction				1