Leases - Narrative (Details)	6 Months Ended
	Jun. 30, 2023 USD ($) aircraft aircraft_engine	Dec. 31, 2022 USD ($)	Dec. 31, 2019 USD ($) a residential_building_unit
Lessee, Lease, Description [Line Items]
Number of aircraft under direct operating leases	6
Number of spare engines owned | aircraft_engine	27
Number of spare engines unencumbered | aircraft_engine	3
Number of spare engines pledged as collateral | aircraft_engine	24
Aircraft maintenance deposits | $	$ 36,600,000	$ 38,800,000
Area of land | a			8.5
Land | $			$ 41,000,000
Noncancellable short-term operating lease, payments, remainder of year | $	3,700,000
Noncancellable short-term operating lease, payments, year one and beyond | $	$ 0
Asset Pledged as Collateral
Lessee, Lease, Description [Line Items]
Number of capitalized aircraft pledged as collateral	2
Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft owned	98
Failed aircraft sale leaseback	1
A320 Family | Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft owned	198
Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft under sale-leaseback transactions	5
Aircraft | A320 Family
Lessee, Lease, Description [Line Items]
Number of leased assets financed under operating leases	99
Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Operating leases, term	8 years
Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term	18 years
Other Leased Equipment and Property
Lessee, Lease, Description [Line Items]
Area of land | a			2.6
Number of units in residential building expected to be built | residential_building_unit			200
Other Leased Equipment and Property | Maximum
Lessee, Lease, Description [Line Items]
Operating leases, term	99 years		99 years
Spare Engines
Lessee, Lease, Description [Line Items]
Number of engines purchased with cash | aircraft_engine	3
Number of leased assets financed under operating leases | aircraft_engine	6
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