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Leases - Amounts recognized in profit and loss (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Leases        
Depreciation of right of use assets $ (253,098) $ (5,048,976) $ (4,702,971) $ (4,043,691)
Interest expense on lease liabilities   (2,350,250) (2,128,162) (1,755,978)
Aircraft and engine variable expenses $ (92,500) (1,845,254) (961,657) (956,010)
Total amount recognized in profit or loss   (9,244,480) (7,792,790) (6,755,679)
Cash outflow for leases   6,110,569 6,499,802 5,710,907
Supplemental Rent   1,428,179 $ 680,964 $ 659,106
Changes to lease payments that arose from concessions of lease modifications   $ 190,811