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COSTS AND EXPENSES BY NATURE (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Material income and expense [abstract]      
Aircraft fuel $ 2,318,816 $ 2,056,643 $ 2,651,067
Other rentals and landing fees 1,172,129 1,077,407 1,109,826
Aircraft rentals 579,551 568,979 525,134
Aircraft maintenance 430,825 366,153 437,235
Comissions 252,474 269,296 302,774
Passenger services 288,662 286,621 295,439
Other operating expenses 1,381,546 1,424,595 1,293,320
Total $ 6,424,003 $ 6,049,694 $ 6,614,795