Summary of Significant Accounting Policies - Property and Equipment Narrative (Details) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Mar. 12, 2025 USD ($)	Dec. 31, 2025 USD ($) a aircraftEngine aircraft aircraftLeasebackTransaction flightSimulator residential_building_unit	Dec. 31, 2024 USD ($) aircraftLeasebackTransaction	Dec. 31, 2023 USD ($)	Mar. 13, 2025 USD ($)
Property, Plant and Equipment [Line Items]
Failed aircraft sale leaseback | aircraftLeasebackTransaction		13	18
Number of spare engines owned | aircraftEngine		18
Number of flight simulators capitalized | flightSimulator		4
Area of land | a		8.5
Land		$ 41,000
Deferred heavy maintenance, net		$ 90,723	$ 241,094		$ 125,705
Other
Property, Plant and Equipment [Line Items]
Area of land | a		2.6
Number of residential building units | residential_building_unit		200
Other | Maximum
Property, Plant and Equipment [Line Items]
Operating lease contract term		99 years
Aircrafts, Major Spare Rotable Parts, Avionics, and Assemblies
Property, Plant and Equipment [Line Items]
Residual value, percentage		10.00%
Aircraft
Property, Plant and Equipment [Line Items]
Failed aircraft sale leaseback | aircraft		13
Aircraft | A320 Family
Property, Plant and Equipment [Line Items]
Number of aircraft capitalized | aircraft		61
Aircraft, engines and flight simulators
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications		25 years
Internal use software
Property, Plant and Equipment [Line Items]
Capitalized computer software, net		$ 34,800	48,800
Capitalized software costs during the year	$ 1,900	$ 13,400	$ 29,200	$ 35,500
Internal use software | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications		10 years