Leases - Narrative (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2025 USD ($) aircraftEngine aircraft	Sep. 30, 2025 USD ($) aircraftEngine aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft under direct operating leases		1
Number of spare engines owned | aircraftEngine	18	18
Noncancellable short-term operating lease, payments, remainder of year | $	$ 2,400,000	$ 2,400,000
Noncancellable short-term operating lease, payments, year one and beyond | $	$ 0	$ 0
Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft owned	48	48
Number of aircraft unencumbered	0	0
Failed aircraft sale leaseback	18	18
A320 Family | Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft owned	214	214
Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft under sale-leaseback transactions		3
Aircraft | A320 Family
Lessee, Lease, Description [Line Items]
Operating leases of lessee, number of leased assets	148	148
Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Operating leases, term	4 years	4 years
Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term	18 years	18 years
Other | Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term	99 years	99 years
Spare Engines
Lessee, Lease, Description [Line Items]
Number of spare engines in completed sale leaseback transactions | aircraftEngine	14
Operating leases of lessee, number of leased assets | aircraftEngine	19	19
Leased Computer And Office Equipment
Lessee, Lease, Description [Line Items]
Finance leases, term	5 years	5 years