Leases - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($) aircraft_engine aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft under direct operating leases	17
Number of spare engines owned | aircraft_engine	34
Number of spare engines unencumbered | aircraft_engine	13
Number of spare engines pledged as collateral | aircraft_engine	21
Noncancellable short-term operating lease, payments, remainder of year | $	$ 2.7
Noncancellable short-term operating lease, payments, year one and beyond | $	$ 0.3
Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft owned	56
Number of aircraft unencumbered	5
Failed aircraft sale leaseback	18
A320 Family | Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft owned	217
Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft under sale-leaseback transactions	7
Aircraft | A320 Family
Lessee, Lease, Description [Line Items]
Operating leases of lessee, number of leased assets	143
Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Operating leases, term	4 years
Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term	18 years
Other | Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term	99 years
Spare Engines
Lessee, Lease, Description [Line Items]
Number of engines purchased with cash | aircraft_engine	4
Number of engines purchased off lease | aircraft_engine	1
Operating leases of lessee, number of leased assets | aircraft_engine	5
Leased Computer And Office Equipment | Minimum
Lessee, Lease, Description [Line Items]
Finance leases, term	4 years
Leased Computer And Office Equipment | Maximum
Lessee, Lease, Description [Line Items]
Finance leases, term	5 years