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Operating Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue recognition      
Fare revenues $ 1,650,287 $ 1,661,176 $ 1,265,980
Other passenger revenues 1,473,237 1,078,251 866,944
Passenger revenues 3,123,524 2,739,427 2,132,924
Other non-passenger revenue 115,424 92,977 76,872
Cargo 20,025 14,786 11,882
Total 3,258,973 2,847,190 2,221,678
Non-derivative financial instruments   (21,378) (21,378)
Operating revenues 3,258,973 2,847,190 2,200,300
Transactions from unearned transportation revenues      
January 1, 346,469 303,982  
Deferred 3,120,455 2,781,914  
Recognized in revenue during the year (3,123,524) (2,739,427)  
December 31, 343,400 346,469 303,982
Domestic      
Revenue recognition      
Operating revenues 2,060,744 1,909,744 1,661,927
Domestic | At the flight time      
Revenue recognition      
Fare revenues 1,027,699 1,097,480 860,143
Other passenger revenues 901,331 695,602 707,368
Passenger revenues 1,929,030 1,793,082 1,567,511
Other non-passenger revenue 114,318 92,088 76,306
Cargo 4,432 13,171 11,410
Total 2,047,780 1,898,341 1,655,227
Domestic | At the sale      
Revenue recognition      
Other passenger revenues 12,964 11,403 6,700
Passenger revenues 12,964 11,403 6,700
Total 12,964 11,403 6,700
International | At the flight time      
Revenue recognition      
Fare revenues 622,588 563,696 405,837
Other passenger revenues 551,075 365,243 151,261
Passenger revenues 1,173,663 928,939 557,098
Other non-passenger revenue 1,106 889 566
Cargo 15,593 1,615 472
Total 1,190,362 931,443 558,136
International | At the sale      
Revenue recognition      
Other passenger revenues 7,867 6,003 1,615
Passenger revenues 7,867 6,003 1,615
Total $ 7,867 $ 6,003 $ 1,615