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PROPERTY, PLANT AND EQUIPMENT - Schedule of movement of property, plant and equipment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
aircraft
Dec. 31, 2022
USD ($)
aircraft
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
aircraft
Property, Plant and Equipment [Roll Forward]        
Opening balance $ 7,021,134 $ 7,335,118 $ 8,323,949  
Additions 938,381 894,097 662,078  
Disposals (2,718) (4,407) (521)  
Rejection fleet     (516,694)  
Retirements (87,749) (43,305) (47,086)  
Depreciation expenses (745,654) (699,046) (648,782)  
Foreign exchange 40,842 22,082 (38,245)  
Other increases (decreases) (272,311) (483,405) (399,581)  
Changes, total (129,209) (313,984) (988,831)  
Closing balance 6,891,925 7,021,134 7,335,118 $ 8,323,949
Advances paid to aircraft manufacturers $ 242,069 $ 357,979 377,590  
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 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 388,810 473,797 377,961  
Additions 8,835 16,332 84,392  
Disposals 0 0 0  
Rejection fleet     0  
Retirements (83) (75) (279)  
Depreciation expenses 0 0 0  
Foreign exchange 726 (1,282) (1,720)  
Other increases (decreases) (140,042) (99,962) 13,443  
Changes, total (130,564) (84,987) 95,836  
Closing balance 258,246 388,810 473,797 $ 377,961
Land        
Property, Plant and Equipment [Roll Forward]        
Opening balance 44,349 43,276 42,978  
Additions 0 0 1,550  
Disposals 0 0 0  
Rejection fleet     0  
Retirements 0 0 0  
Depreciation expenses 0 0 0  
Foreign exchange 1,445 1,073 (1,252)  
Other increases (decreases) (1,550) 0 0  
Changes, total (105) 1,073 298  
Closing balance 44,244 44,349 43,276 42,978
Buildings net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 68,996 60,451 65,207  
Additions 0 0 92  
Disposals 0 0 0  
Rejection fleet     0  
Retirements 0 (2) 0  
Depreciation expenses (4,104) (3,285) (4,074)  
Foreign exchange 1,505 918 (833)  
Other increases (decreases) 1,161 10,914 59  
Changes, total (1,438) 8,545 (4,756)  
Closing balance 67,558 68,996 60,451 65,207
Plant and equipment net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 6,304,848 6,568,717 7,698,969  
Additions 870,640 843,808 563,023  
Disposals (2,701) (4,140) (169)  
Rejection fleet     (469,878)  
Retirements (87,652) (42,055) (44,684)  
Depreciation expenses (716,590) (669,059) (620,349)  
Foreign exchange 23,845 11,527 (19,199)  
Other increases (decreases) (156,046) (403,950) (538,996)  
Changes, total (68,504) (263,869) (1,130,252)  
Closing balance 6,236,344 6,304,848 6,568,717 7,698,969
Information technology equipment net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 16,609 16,836 14,831  
Additions 5,794 6,426 6,455  
Disposals (1) 0 (26)  
Rejection fleet     0  
Retirements (12) (24) (212)  
Depreciation expenses (5,918) (5,662) (4,345)  
Foreign exchange 536 (84) (404)  
Other increases (decreases) 334 (883) 537  
Changes, total 733 (227) 2,005  
Closing balance 17,342 16,609 16,836 14,831
Fixed installations & accessories net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 37,072 38,741 49,199  
Additions 4,246 113 6  
Disposals 0 (264) (309)  
Rejection fleet     0  
Retirements (2) (836) (1,885)  
Depreciation expenses (8,789) (7,914) (8,304)  
Foreign exchange 1,276 2,365 (1,752)  
Other increases (decreases) 20,607 4,867 1,786  
Changes, total 17,338 (1,669) (10,458)  
Closing balance 54,410 37,072 38,741 49,199
Motor vehicles net        
Property, Plant and Equipment [Roll Forward]        
Opening balance 423 325 396  
Additions 0 258 17  
Disposals (16) (3) (17)  
Rejection fleet     0  
Retirements 0 0 0  
Depreciation expenses (68) (55) (61)  
Foreign exchange 12 (28) (11)  
Other increases (decreases) 0 (74) 1  
Changes, total (72) 98 (71)  
Closing balance 351 423 325 396
Leasehold improvements        
Property, Plant and Equipment [Roll Forward]        
Opening balance 160,027 132,975 74,408  
Additions 48,866 27,160 6,543  
Disposals 0 0 0  
Rejection fleet     (46,816)  
Retirements 0 (313) (26)  
Depreciation expenses (10,185) (13,071) (11,649)  
Foreign exchange 11,497 7,593 (13,074)  
Other increases (decreases) 3,225 5,683 123,589  
Changes, total 53,403 27,052 58,567  
Closing balance $ 213,430 $ 160,027 $ 132,975 $ 74,408