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PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment [Line Items]      
Opening balance $ 10,049,920 $ 9,953,365 $ 10,065,335
Additions 493,639 1,766,141 668,787
Disposals (1,586) (24,119) (6,285)
Rejection fleet [1] (1,081,578)    
Retirements (111,256) (65,382) (63,996)
Depreciation expenses (718,767) (821,607) (763,923)
Foreign exchange (170,405) (30,770) (116,491)
Other increases (decreases) (136,017) [2] (727,708) 164,197
Adjustment application IAS 29     5,741
Changes, total (1,725,970) 96,555 (111,970)
Closing balance 8,323,950 10,049,920 9,953,365
Construction in progress [Member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment [Line Items]      
Opening balance 372,589 630,320 556,822
Additions 6,535 21,884 7,927
Disposals
Rejection fleet [1]    
Retirements (39) (20) (80)
Depreciation expenses
Foreign exchange (2,601) (1,340) (714)
Other increases (decreases) 1,477 [2] (278,255) 65,992
Adjustment application IAS 29     373
Changes, total 5,372 (257,731) 73,498
Closing balance 377,961 372,589 630,320
Land [Member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment [Line Items]      
Opening balance 48,406 45,424 49,780
Additions 7,950  
Disposals (28) (8)
Rejection fleet [1]    
Retirements
Depreciation expenses
Foreign exchange (5,428) (1,103) (4,348)
Other increases (decreases) 1 [2] (3,837)
Adjustment application IAS 29    
Changes, total (5,427) 2,982 (4,356)
Closing balance 42,979 48,406 45,424
Buildings net [Member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment [Line Items]      
Opening balance 74,862 112,565 124,548
Additions  
Disposals (47) (1,412)
Rejection fleet [1]    
Retirements (19)
Depreciation expenses (4,819) (5,768) (6,219)
Foreign exchange (4,836) (914) (4,244)
Other increases (decreases) [2] (30,974) (89)
Adjustment application IAS 29    
Changes, total (9,655) (37,703) (11,983)
Closing balance 65,207 74,862 112,565
Plant and Equipment Net [Member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment [Line Items]      
Opening balance 9,374,516 8,987,582 9,138,591
Additions 485,800 1,694,640 635,367
Disposals (1,439) (23,945) (4,747)
Rejection fleet [1] (1,081,496)    
Retirements (107,912) (64,838) (63,774)
Depreciation expenses (682,102) (776,225) (705,577)
Foreign exchange (146,219) (24,615) (94,488)
Other increases (decreases) (142,179) [2] (418,083) 78,341
Adjustment application IAS 29     3,869
Changes, total (1,675,547) 386,934 (151,009)
Closing balance 7,698,969 9,374,516 8,987,582
Information technology equipment net [Member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment [Line Items]      
Opening balance 20,776 22,564 30,156
Additions 1,295 6,580 4,995
Disposals (112) (13) (30)
Rejection fleet [1]    
Retirements (55) (85) (92)
Depreciation expenses (6,186) (8,574) (11,677)
Foreign exchange (1,543) (234) (1,819)
Other increases (decreases) 656 [2] 538 732
Adjustment application IAS 29     299
Changes, total (5,945) (1,788) (7,592)
Closing balance 14,831 20,776 22,564
Fixed installations & accessories net [Member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment [Line Items]      
Opening balance 59,834 71,009 80,777
Additions 9 26 64
Disposals (31) (75) (74)
Rejection fleet [1]    
Retirements (3,250) (77) (27)
Depreciation expenses (9,037) (11,945) (12,538)
Foreign exchange (7,195) (2,007) (8,499)
Other increases (decreases) 8,869 [2] 2,903 10,195
Adjustment application IAS 29     1,111
Changes, total (10,635) (11,175) (9,768)
Closing balance 49,199 59,834 71,009
Motor vehicles net [Member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment [Line Items]      
Opening balance 477 634 436
Additions 73 24
Disposals (4) (11) (14)
Rejection fleet [1]    
Retirements  
Depreciation expenses (81) (94) (146)
Foreign exchange 4 (125) (28)
Other increases (decreases) [2] 273
Adjustment application IAS 29     89
Changes, total (81) (157) 198
Closing balance 396 477 634
Leasehold improvements [Member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of movement of property, plant and equipment [Line Items]      
Opening balance 98,460 83,267 84,225
Additions 34,988 20,410
Disposals
Rejection fleet [1] (82)    
Retirements   (362) (4)
Depreciation expenses (16,542) (19,001) (27,766)
Foreign exchange (2,587) (432) (2,351)
Other increases (decreases) (4,841) [2] 8,753
Adjustment application IAS 29    
Changes, total (24,052) 15,193 (958)
Closing balance $ 74,408 $ 98,460 $ 83,267
[1] Include aircraft lease rejection due to Chapter 11 process.
[2] Include the reclassification of 4 A350 aircraft that were incorporated on property plant and equipment from available for sale for ThU$ 464,812 and the reclassification of 11 B767 aircraft that were moved to available for sales for ThU$ 606,522 (see note 13).