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ACCOUNTS PAYABLE, NON-CURRENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Trade and other payables [abstract]    
Aircraft and engine maintenance $ 483,795 $ 347,085
Provision for vacations and bonuses 14,725 12,080
Other sundry liabilities 312 226
Total accounts payable, non-current $ 498,832 $ 359,391