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Revenue from contract with customers - Summary of Disaggregated Operating Revenues (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenue $ 52,330 $ 43,538 $ 38,549
Total operating revenue 3,446,198 3,457,004 2,965,033
Total passenger and cargo and mail revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,393,868 3,413,466 2,926,484
Passenger revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,293,361 3,316,361 2,824,719
Passenger revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,220,718 3,263,764 2,793,420
Miles redeemed      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 72,643 52,597 31,299
Cargo and mail revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 100,507 97,105 101,765
Frequent flyer program - marketing services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenue 47,844 37,930 28,396
Other operating revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenue $ 4,486 $ 5,608 $ 10,153