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Property and equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance $ 3,238,632 $ 2,883,524  
Ending balance 3,458,260 3,238,632 $ 2,883,524
Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 4,583,633 4,070,753 3,576,449
Transfer of pre-delivery payments 0 0 0
Additions 475,401 598,059 622,478
Disposals (80,031) (59,779) (51,974)
Reclassifications 38 (25,400) (76,200)
Ending balance 4,979,041 4,583,633 4,070,753
Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (1,345,001) (1,187,229) (1,063,745)
Depreciation for the year (240,861) (209,907) (171,910)
Disposals 65,081 52,135 48,426
Ending balance (1,520,781) (1,345,001) (1,187,229)
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 2,481,139 2,104,450  
Ending balance 2,859,311 2,481,139 2,104,450
Flight equipment | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 3,695,677 3,167,519 2,925,576
Transfer of pre-delivery payments 175,930 211,703 50,977
Additions 444,469 373,983 228,908
Disposals (75,550) (56,979) (46,121)
Reclassifications 2,329 (549) 8,179
Ending balance 4,242,855 3,695,677 3,167,519
Flight equipment | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (1,214,538) (1,063,069) (942,026)
Depreciation for the year (229,622) (200,851) (163,674)
Disposals 60,616 49,382 42,631
Ending balance (1,383,544) (1,214,538) (1,063,069)
Purchase deposits for flight equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 700,180 732,253  
Ending balance 538,237 700,180 732,253
Purchase deposits for flight equipment | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 700,180 732,253 476,254
Transfer of pre-delivery payments (175,930) (211,703) (50,977)
Additions 13,987 205,030 383,176
Disposals 0 0 0
Reclassifications 0 (25,400) (76,200)
Ending balance 538,237 700,180 732,253
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 9,685 8,267  
Ending balance 11,967 9,685 8,267
Ramp and miscellaneous | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 58,636 55,070 53,562
Transfer of pre-delivery payments 0 0 0
Additions 5,205 3,993 2,903
Disposals (945) (427) (1,395)
Reclassifications 0 0 0
Ending balance 62,896 58,636 55,070
Ramp and miscellaneous | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (48,951) (46,803) (45,777)
Depreciation for the year (2,923) (2,546) (2,392)
Disposals 945 398 1,366
Ending balance (50,929) (48,951) (46,803)
Furniture, fixtures, equipment and other      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 5,470 3,906  
Ending balance 5,615 5,470 3,906
Furniture, fixtures, equipment and other | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 35,242 32,958 33,905
Transfer of pre-delivery payments 0 0 0
Additions 3,260 3,760 3,318
Disposals (2,441) (1,476) (4,265)
Reclassifications 39 0 0
Ending balance 36,100 35,242 32,958
Furniture, fixtures, equipment and other | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (29,772) (29,052) (31,963)
Depreciation for the year (3,143) (2,190) (1,354)
Disposals 2,430 1,470 4,265
Ending balance (30,485) (29,772) (29,052)
Leasehold improvements      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 24,242 25,966  
Ending balance 29,461 24,242 25,966
Leasehold improvements | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 75,978 74,267 65,267
Transfer of pre-delivery payments 0 0 0
Additions 3,701 1,991 3,291
Disposals (1,095) (897) (164)
Reclassifications 6,696 617 5,873
Ending balance 85,280 75,978 74,267
Leasehold improvements | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (51,736) (48,301) (43,975)
Depreciation for the year (5,173) (4,320) (4,490)
Disposals 1,090 885 164
Ending balance (55,819) (51,736) (48,301)
Construction in progress      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 11,615 2,381  
Ending balance 7,368 11,615 2,381
Construction in progress | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 11,619 2,385 15,584
Transfer of pre-delivery payments 0 0 0
Additions 4,779 9,302 882
Disposals 0 0 (29)
Reclassifications (9,026) (68) (14,052)
Ending balance 7,372 11,619 2,385
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)