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Revenue from contract with customers - Summary of Disaggregated Operating Revenues (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenues $ 70,851 $ 52,330 $ 43,538
Total operating revenue 3,617,822 3,446,198 3,457,004
Total passenger and cargo and mail revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,546,971 3,393,868 3,413,466
Passenger revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,431,253 3,293,361 3,316,361
Passenger revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,363,175 3,220,718 3,263,764
Miles redeemed      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 68,078 72,643 52,597
Cargo and mail revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 115,718 100,507 97,105
Frequent flyer program - marketing services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenues 66,749 47,844 37,930
Other operating revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenues $ 4,102 $ 4,486 $ 5,608