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Accrued liabilities - Other liabilities (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis of accrued liabilities      
Balance at beginning of the year $ 1,846,029 $ 1,657,040 $ 1,418,734
Increase for the year 747,640 1,029,497 1,107,939
Payments 716,884 840,508 869,633
Balance at end of the year 1,876,785 1,846,029 1,657,040
Aircraft and engine lease return obligation      
Analysis of accrued liabilities      
Balance at beginning of the year 1,831,045 1,647,977 1,408,039
Increase for the year 725,506 1,015,391 1,099,597
Payments 703,863 832,323 859,659
Balance at end of the year 1,852,688 1,831,045 1,647,977
Employee profit sharing      
Analysis of accrued liabilities      
Balance at beginning of the year 14,984 9,063 10,695
Increase for the year 22,134 14,106 8,342
Payments 13,021 8,185 9,974
Balance at end of the year $ 24,097 $ 14,984 $ 9,063