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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of inventories [text block] [Abstract]  
Schedule of composition of inventories [Text Block]]
   As of   As of 
   December 31,   December 31, 
   2019   2018 
   ThUS$   ThUS$ 
         
Technical stock   315,286    233,276 
Non-technical stock   38,946    46,068 
Total   354,232    279,344 
Schedule of inventory average cost, net of provision for obsolescence [Text Block]]
   As of   As of 
   December 31,   December 31, 
   2019   2018 
   ThUS$   ThUS$ 
         
Provision for obsolescence Technical stock   21,193    20,500 
Provision for obsolescenceNon-technical stock   11,610    4,621 
Total   32,803    25,121