Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,432,472	$ 1,366,643	$ 2,782,246	$ 2,333,958
Air traffic liability	479,677		479,677		$ 429,618
DOT—Domestic
Disaggregation of Revenue [Line Items]
Total operating revenues	1,244,818	1,165,746	2,420,554	1,993,200
DOT—Latin America
Disaggregation of Revenue [Line Items]
Total operating revenues	187,654	200,897	361,692	340,758
Total passenger revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	1,410,061	1,347,871	2,737,534	2,297,615
Fare
Disaggregation of Revenue [Line Items]
Total operating revenues	647,344	703,778	1,256,205	1,122,196
Non-fare
Disaggregation of Revenue [Line Items]
Total operating revenues	762,717	644,093	1,481,329	1,175,419
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 22,411	$ 18,772	$ 44,712	$ 36,343