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OTHER NON-FINANCIAL ASSETS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of financial assets [line items] |  |  |  |
Current Assets |  | $ 221,188 |  | $ 212,242
Non-current assets |  | 220,807 |  | 237,344
Total Assets |  | 441,995 |  | 449,586
Advance Payments Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  | 59,015 | [1] | 56,798
Non-current assets |  | 5,904 | [1] | 15,638
Total Assets |  | 64,919 | [1] | 72,436
Other Assets Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  | 162,173 |  | 155,444
Non-current assets |  | 214,903 |  | 221,706
Total Assets |  | 377,076 |  | 377,150
Aircraft Leases [Member] | Advance Payments Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  | 31,322 |  | 37,560
Non-current assets |  | 4,718 |  | 14,065
Total Assets |  | 36,040 |  | 51,625
Aircraft Insurance And Other [Member] | Advance Payments Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  | 17,681 |  | 14,717
Non-current assets |  |  |  |
Total Assets |  | 17,681 |  | 14,717
Others [Member] | Advance Payments Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  | 10,012 |  | 4,521
Non-current assets |  | 1,186 |  | 1,573
Total Assets |  | 11,198 |  | 6,094
Others [Member] | Other Assets Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  |  |  | 611
Non-current assets |  |  |  | 104
Total Assets |  |  |  | 715
Aircraft Maintenance Reserve [Member] | Other Assets Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets | [1] | 21,505 |  | 51,576
Non-current assets | [1] | 51,836 |  | 90,175
Total Assets | [1] | 73,341 |  | 141,751
Sales Tax [Member] | Other Assets Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  | 137,866 |  | 102,351
Non-current assets |  | 37,959 |  | 40,232
Total Assets |  | 175,825 |  | 142,583
Other Taxes [Member] | Other Assets Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  | 2,475 |  | 500
Non-current assets |  |  |  |
Total Assets |  | 2,475 |  | 500
Contributions to Societe Internationale de Telecommunications Aeronautiques ("SITA") [Member] | Other Assets Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  | 327 |  | 406
Non-current assets |  | 670 |  | 591
Total Assets |  | 997 |  | 997
Judicial Deposits [Member] | Other Assets Categories [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Current Assets |  |  |  |
Non-current assets |  | 124,438 |  | 90,604
Total Assets |  | $ 124,438 |  | $ 90,604
[1] | Aircraft maintenance reserves reflect prepayment deposits made by the group to lessors of certain aircraft under operating lease agreements in order to ensure that funds are available to support the scheduled heavy maintenance of the aircraft.

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