Leases - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) a aircraft_engine aircraft	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) a residential_building_unit
Lessee, Lease, Description [Line Items]
Number of spare engines capitalized | aircraft_engine	24
Number of spare engines capitalized and unencumbered | aircraft_engine	1
Total rental expense	$ 537,900,000	$ 449,400,000	$ 371,600,000
Aircraft rent	$ 282,428,000	$ 246,601,000	$ 196,359,000
Cost, Product and Service [Extensible List]	Aircraft rent	Aircraft rent	Aircraft rent
Aircraft maintenance deposits	$ 38,800,000	$ 48,900,000
Supplemental rent expense	16,500,000	31,700,000	$ 3,300,000
Maintenance reserves, supplemental rent	$ 0	0
Area of land | a	8.5			8.5
Land				$ 41,000,000
Property and equipment	$ 3,749,498,000	$ 3,856,593,000
Operating lease not yet commenced, amount, 2023	3,900,000
Operating lease not yet commenced, amount, 2024 and beyond	$ 0
Third Party Lessor
Lessee, Lease, Description [Line Items]
Number of delivered leased aircraft | aircraft	5
Asset Pledged as Collateral
Lessee, Lease, Description [Line Items]
Number of capitalized aircraft pledged as collateral | aircraft	4
Number of spare engines capitalized were pledged as collateral | aircraft_engine	23
Aircraft
Lessee, Lease, Description [Line Items]
Number of capitalized aircraft or engine purchased off lease | aircraft	33
Failed aircraft sale leaseback | aircraft	1
Construction
Lessee, Lease, Description [Line Items]
Property and equipment	$ 62,600,000
A320 Family
Lessee, Lease, Description [Line Items]
Number of aircraft held | aircraft	194
A320 Family | Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft owned | aircraft	105
Minimum | Aircraft
Lessee, Lease, Description [Line Items]
Finance lease contract term	8 years
Maximum | Aircraft
Lessee, Lease, Description [Line Items]
Finance lease contract term	18 years
Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft under sale-leaseback transactions | aircraft	16
Aircraft | A320 Family
Lessee, Lease, Description [Line Items]
Number of aircraft under operating lease | aircraft	88
Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Operating lease contract term	8 years
Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Operating lease contract term	18 years
Other
Lessee, Lease, Description [Line Items]
Area of land | a				2.6
Number of residential building unit expected to be built | residential_building_unit				200
Other | Maximum
Lessee, Lease, Description [Line Items]
Operating lease contract term	99 years			99 years
Spare engines
Lessee, Lease, Description [Line Items]
Number of aircraft under operating lease | aircraft_engine	6
Number of engines purchased with cash | aircraft_engine	4
Leased Computer And Office Equipment | Minimum
Lessee, Lease, Description [Line Items]
Finance lease contract term	4 years
Leased Computer And Office Equipment | Maximum
Lessee, Lease, Description [Line Items]
Finance lease contract term	5 years