Leases, Commitments, Guarantees and Contingencies (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) aircraft	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 92,803		$ 92,803		$ 151,928
Current maturities of lease liabilities	18,715		18,715		71,726
Noncurrent operating leases	$ 73,894		73,894		$ 88,622
Operating leases			$ 17,900
Weighted-average remaining lease term for operating leases	9 years 8 months 12 days		9 years 8 months 12 days
Weighted-average discount rate for operating leases	6.10%		6.10%
Lease costs
Operating lease cost	$ 7,857	$ 21,822	$ 32,805	$ 43,663
Variable and short-term lease cost	534	805	1,337	1,822
Sublease income	(1,351)	(1,845)	(2,701)	(3,648)
Total lease cost	7,040	$ 20,782	$ 31,441	$ 41,837
CRJ Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft acquired | aircraft			32
Lease liability payable due	$ 125,500		$ 125,500
Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft acquired | aircraft			11
Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year		1 year
Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	7 years		7 years
Airport Facilities | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 month		1 month
Airport Facilities | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	33 years		33 years