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Revenue from contract with customers - Summary of Disaggregated Operating Revenues (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenue $ 43,538 $ 38,549 $ 25,964
Total operating revenue 3,457,004 2,965,033 1,509,931
Passenger revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,316,361 2,824,719 1,412,390
Passenger revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,263,764 2,793,420 1,388,089
Miles redeemed      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 52,597 31,299 24,301
Cargo and mail revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 97,105 101,765 71,577
Frequent flyer program - marketing services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenue 37,930 28,396 18,897
Other operating revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenue $ 5,608 $ 10,153 $ 7,067