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Property and equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance $ 3,458,260 $ 3,238,632  
Ending balance 4,120,055 3,458,260 $ 3,238,632
Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 4,979,041 4,583,633 4,070,753
Transfer of pre-delivery payments 0 0 0
Additions 976,607 475,401 598,059
Disposals (159,594) (80,031) (59,779)
Reclassifications 0 38 (25,400)
Ending balance 5,796,054 4,979,041 4,583,633
Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (1,520,781) (1,345,001) (1,187,229)
Depreciation for the year (275,650) (240,861) (209,907)
Disposals 120,432 65,081 52,135
Ending balance (1,675,999) (1,520,781) (1,345,001)
Land      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 6,301 6,301  
Ending balance 6,301 6,301 6,301
Land | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 6,301 6,301 6,301
Transfer of pre-delivery payments 0 0 0
Additions 0 0 0
Disposals 0 0 0
Reclassifications 0 0 0
Ending balance 6,301 6,301 6,301
Land | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 0 0 0
Depreciation for the year 0 0 0
Disposals 0 0 0
Ending balance 0 0 0
Flight equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 2,859,311 2,481,139  
Ending balance 3,594,807 2,859,311 2,481,139
Flight equipment | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 4,242,855 3,695,677 3,167,519
Transfer of pre-delivery payments 371,589 175,930 211,703
Additions 662,838 444,469 373,983
Disposals (152,747) (75,550) (56,979)
Reclassifications 85 2,329 (549)
Ending balance 5,124,620 4,242,855 3,695,677
Flight equipment | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (1,383,544) (1,214,538) (1,063,069)
Depreciation for the year (262,922) (229,622) (200,851)
Disposals 116,653 60,616 49,382
Ending balance (1,529,813) (1,383,544) (1,214,538)
Purchase deposits for flight equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 538,237 700,180  
Ending balance 468,217 538,237 700,180
Purchase deposits for flight equipment | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 538,237 700,180 732,253
Transfer of pre-delivery payments (371,589) (175,930) (211,703)
Additions 301,569 13,987 205,030
Disposals 0 0 0
Reclassifications 0 0 (25,400)
Ending balance 468,217 538,237 700,180
Purchase deposits for flight equipment | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 0 0 0
Depreciation for the year 0 0 0
Disposals 0 0 0
Ending balance 0 0 0
Ramp and miscellaneous      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 11,967 9,685  
Ending balance 12,552 11,967 9,685
Ramp and miscellaneous | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 62,896 58,636 55,070
Transfer of pre-delivery payments 0 0 0
Additions 3,942 5,205 3,993
Disposals (1,332) (945) (427)
Reclassifications (5) 0 0
Ending balance 65,501 62,896 58,636
Ramp and miscellaneous | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (50,929) (48,951) (46,803)
Depreciation for the year (3,344) (2,923) (2,546)
Disposals 1,324 945 398
Ending balance (52,949) (50,929) (48,951)
Furniture, fixtures, equipment and other      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 5,615 5,470  
Ending balance 5,851 5,615 5,470
Furniture, fixtures, equipment and other | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 36,100 35,242 32,958
Transfer of pre-delivery payments 0 0 0
Additions 3,925 3,260 3,760
Disposals (2,219) (2,441) (1,476)
Reclassifications 0 39 0
Ending balance 37,806 36,100 35,242
Furniture, fixtures, equipment and other | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (30,485) (29,772) (29,052)
Depreciation for the year (3,646) (3,143) (2,190)
Disposals 2,176 2,430 1,470
Ending balance (31,955) (30,485) (29,772)
Leasehold improvements      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 29,461 24,242  
Ending balance 28,729 29,461 24,242
Leasehold improvements | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 85,280 75,978 74,267
Transfer of pre-delivery payments 0 0 0
Additions 1,943 3,701 1,991
Disposals (296) (1,095) (897)
Reclassifications 3,080 6,696 617
Ending balance 90,007 85,280 75,978
Leasehold improvements | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (55,819) (51,736) (48,301)
Depreciation for the year (5,738) (5,173) (4,320)
Disposals 279 1,090 885
Ending balance (61,278) (55,819) (51,736)
Construction in progress      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 7,368 11,615  
Ending balance 3,598 7,368 11,615
Construction in progress | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 7,372 11,619 2,385
Transfer of pre-delivery payments 0 0 0
Additions 2,390 4,779 9,302
Disposals (3,000) 0 0
Reclassifications (3,160) (9,026) (68)
Ending balance 3,602 7,372 11,619
Construction in progress | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (4) (4) (4)
Depreciation for the year 0 0 0
Disposals 0 0 0
Ending balance $ (4) $ (4) $ (4)