Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,366,643	$ 859,309	$ 2,333,958	$ 1,320,588
Air traffic liability	561,705		561,705		$ 382,317
DOT—Domestic
Disaggregation of Revenue [Line Items]
Total operating revenues	1,165,746	770,800	1,993,200	1,177,964
DOT—Latin America
Disaggregation of Revenue [Line Items]
Total operating revenues	200,897	88,509	340,758	142,624
Total passenger revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	1,347,871	846,507	2,297,615	1,296,842
Fare
Disaggregation of Revenue [Line Items]
Total operating revenues	703,778	369,691	1,122,196	543,978
Non-fare
Disaggregation of Revenue [Line Items]
Total operating revenues	644,093	476,816	1,175,419	752,864
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 18,772	$ 12,802	$ 36,343	$ 23,746