Summary of Significant Accounting Policies - Passenger Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Air traffic liability	$ 429,618	$ 382,317
Total operating revenues	$ 5,068,447	3,230,775	$ 1,810,022
Credit shell term of expiration	90 days
Fare
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 2,455,817	1,422,927	756,225
Non-fare revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	2,533,548	1,752,875	1,009,308
Passenger
Disaggregation of Revenue [Line Items]
Total operating revenues	4,989,365	3,175,802	1,765,533
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 79,082	$ 54,973	$ 44,489