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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of inventories [text block] [Abstract]  
Schedule of composition of inventories
   As of   As of 
   December 31,   December 31, 
   2020   2019 
   ThUS$   ThUS$ 
Technical stock   284,409    315,286 
Non-technical stock   39,165    38,946 
Total   323,574    354,232 
Schedule of inventory average cost, net of provision for obsolescence
   As of   As of 
   December 31,   December 31, 
   2020   2019 
   ThUS$   ThUS$ 
Provision for obsolescence Technical stock   42,979    21,193 
Provision for obsolescence Non-technical stock   4,651    11,610 
Total   47,630    32,803