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Accrued liabilities - Other liabilities (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Analysis of accrued liabilities      
Balance at beginning of the year $ 497,446 $ 420,755 $ 159,499
Increase for the year 788,720 946,324 1,035,724
Payments 840,508 869,633 774,468
Balance at end of the year 445,658 497,446 420,755
Aircraft lease return obligation      
Analysis of accrued liabilities      
Balance at beginning of the year 488,383 410,060 149,326
Increase for the year 774,614 937,982 1,025,757
Payments 832,323 859,659 765,023
Balance at end of the year 430,674 488,383 410,060
Employee profit sharing      
Analysis of accrued liabilities      
Balance at beginning of the year 9,063 10,695 10,173
Increase for the year 14,106 8,342 9,967
Payments 8,185 9,974 9,445
Balance at end of the year $ 14,984 $ 9,063 $ 10,695