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PROPERTY, PLANT AND EQUIPMENT - Schedule of movement of property, plant and equipment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
aircraft
Dec. 31, 2023
USD ($)
aircraft
Dec. 31, 2022
USD ($)
aircraft
Dec. 31, 2020
aircraft
Property, Plant and Equipment [Roll Forward]        
Opening balance $ 6,891,925 $ 7,021,134 $ 7,335,118  
Additions 1,254,173 938,381 894,097  
Disposals (2,950) (2,718) (4,407)  
Rejection fleet   0 0  
Retirements (56,328) (87,749) (43,305)  
Depreciation expenses (799,552) (745,654) (699,046)  
Foreign exchange (164,663) 40,842 22,082  
Other increases (decreases) 348,538 (272,311) (483,405)  
Changes, total 579,218 (129,209) (313,984)  
Closing balance $ 7,471,143 $ 6,891,925 $ 7,021,134  
Number of aircraft transferred to held for sale | aircraft 0      
Airbus A319        
Property, Plant and Equipment [Roll Forward]        
Number of aircraft transferred to held for sale | aircraft 26      
Non-current assets or disposal groups classified as held for sale        
Property, Plant and Equipment [Roll Forward]        
Number of aircraft transferred to held for sale | aircraft 9      
Non-current assets or disposal groups classified as held for sale | Boeing 767        
Property, Plant and Equipment [Roll Forward]        
Number of aircraft transferred to held for sale | aircraft   1   11
Reclassified to non-current assets   $ (21,578)    
Non-current assets or disposal groups classified as held for sale | Airbus A320        
Property, Plant and Equipment [Roll Forward]        
Number of aircraft transferred to held for sale | aircraft 3 6 6  
Reclassified to non-current assets   $ (36,326) $ (29,328)  
Non-current assets or disposal groups classified as held for sale | Airbus A319        
Property, Plant and Equipment [Roll Forward]        
Number of aircraft transferred to held for sale | aircraft     28  
Reclassified to non-current assets     $ (373,410)  
Construction in progress        
Property, Plant and Equipment [Roll Forward]        
Opening balance $ 258,246 388,810 473,797  
Additions 20,754 8,835 16,332  
Disposals 0 0 0  
Rejection fleet   0 0  
Retirements 0 (83) (75)  
Depreciation expenses 0 0 0  
Foreign exchange (1,354) 726 (1,282)  
Other increases (decreases) 202,225 (140,042) (99,962)  
Changes, total 221,625 (130,564) (84,987)  
Closing balance 479,871 258,246 388,810  
Land        
Property, Plant and Equipment [Roll Forward]        
Opening balance 44,244 44,349 43,276  
Additions 0 0 0  
Disposals 0 0 0  
Rejection fleet   0 0  
Retirements 0 0 0  
Depreciation expenses 0 0 0  
Foreign exchange (4,426) 1,445 1,073  
Other increases (decreases) 0 (1,550) 0  
Changes, total (4,426) (105) 1,073  
Closing balance 39,818 44,244 44,349  
Buildings net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 67,558 68,996 60,451  
Additions 0 0 0  
Disposals 0 0 0  
Rejection fleet   0 0  
Retirements 0 0 (2)  
Depreciation expenses (3,992) (4,104) (3,285)  
Foreign exchange (3,143) 1,505 918  
Other increases (decreases) 0 1,161 10,914  
Changes, total (7,135) (1,438) 8,545  
Closing balance 60,423 67,558 68,996  
Plant and equipment net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 6,236,344 6,304,848 6,568,717  
Additions 1,215,040 870,640 843,808  
Disposals (2,940) (2,701) (4,140)  
Rejection fleet   0 0  
Retirements (56,148) (87,652) (42,055)  
Depreciation expenses (771,104) (716,590) (669,059)  
Foreign exchange (108,966) 23,845 11,527  
Other increases (decreases) 136,506 (156,046) (403,950)  
Changes, total 412,388 (68,504) (263,869)  
Closing balance 6,648,732 6,236,344 6,304,848  
Information technology equipment net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 17,342 16,609 16,836  
Additions 9,669 5,794 6,426  
Disposals (8) (1) 0  
Rejection fleet   0 0  
Retirements (91) (12) (24)  
Depreciation expenses (5,724) (5,918) (5,662)  
Foreign exchange (1,780) 536 (84)  
Other increases (decreases) (115) 334 (883)  
Changes, total 1,951 733 (227)  
Closing balance 19,293 17,342 16,609  
Fixed installations & accessories net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 54,410 37,072 38,741  
Additions 421 4,246 113  
Disposals 0 0 (264)  
Rejection fleet   0 0  
Retirements (89) (2) (836)  
Depreciation expenses (8,877) (8,789) (7,914)  
Foreign exchange (5,401) 1,276 2,365  
Other increases (decreases) 7,509 20,607 4,867  
Changes, total (6,437) 17,338 (1,669)  
Closing balance 47,973 54,410 37,072  
Motor vehicles net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 351 423 325  
Additions 0 0 258  
Disposals (2) (16) (3)  
Rejection fleet   0 0  
Retirements 0 0 0  
Depreciation expenses (65) (68) (55)  
Foreign exchange 0 12 (28)  
Other increases (decreases) 0 0 (74)  
Changes, total (67) (72) 98  
Closing balance 284 351 423  
Leasehold improvements        
Property, Plant and Equipment [Roll Forward]        
Opening balance 213,430 160,027 132,975  
Additions 8,289 48,866 27,160  
Disposals 0 0 0  
Rejection fleet   0 0  
Retirements 0 0 (313)  
Depreciation expenses (9,790) (10,185) (13,071)  
Foreign exchange (39,593) 11,497 7,593  
Other increases (decreases) 2,413 3,225 5,683  
Changes, total (38,681) 53,403 27,052  
Closing balance $ 174,749 $ 213,430 $ 160,027