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