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Financial instruments and risk management - Foreign exchange on and off-balance sheet exposure (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
MXN ($)
$ / $
Dec. 31, 2018
MXN ($)
$ / $
Apr. 29, 2021
$ / $
Dec. 31, 2020
$ / $
Dec. 31, 2020
Q / $
Dec. 31, 2020
₡ / $
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
Q / $
Dec. 31, 2019
₡ / $
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
Q / $
Dec. 31, 2018
₡ / $
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Assets                                
Cash and cash equivalents             $ 506,468,000 $ 10,103,385     $ 400,025,000 $ 7,979,972     $ 5,862,942 $ 6,950,879
Other accounts receivable, net             28,104,000 560,640       923,000        
Total assets             3,418,223,000 68,189,113       63,295,127        
Liabilities                                
Financial debt (Note 5)               5,354,633       4,975,969     3,523,198  
Lease liabilities               44,130,542       40,517,045     $ 39,565,146  
Suppliers             112,275,000 2,239,736       1,597,099        
Derivative financial instruments               9,657                
Total liabilities             $ 3,278,055,000 $ 65,392,928       $ 57,765,444        
Exchange rate 18.8452 19.6829 19.9785 19.9487 7.8095 615.7800 19.9487   7.6988 573.4400 18.8452   7.7440 609.6100    
Unrealized gains relating to the foreign currency forward contracts is included in OCI   $ 14,241                            
Net gains on foreign currency forward contacts $ 4,199                              
Net loss on foreign currency forward contract   $ 52,516                            
Lease liability designated as hedging forecasted revenues over the remaining lease term                     $ 2,100,000,000          
Hedging relationship for foreign exchange rate with non-derivative financial instruments, which represent a portion of the financial assets denominated in USD             $ 410,000,000                  
Recognized leasing liabilities, which have been designated as hedging instruments, forecasted revenues over the remaining lease term             1,500,000,000       1,700,000,000          
Recognized financial assets designated under hedging strategy             60,500,000       166,700,000          
Foreign currency                                
Assets                                
Cash and cash equivalents             495,612,000       373,099,000          
Other accounts receivable, net             39,997,000       23,620,000          
Guarantee deposits             479,566,000       437,499,000          
Derivative financial instruments             10,000       7,088,000          
Total assets             1,015,185,000       841,306,000          
Liabilities                                
Financial debt (Note 5)             183,806,000       176,927,000          
Lease liabilities             2,334,153,000       2,263,849,000          
Suppliers             174,553,000       76,471,000          
Other taxes and fees payable             16,105,000       22,486,000          
Derivative financial instruments             484,000                  
Total liabilities             2,709,101,000       2,539,733,000          
Net foreign currency position             $ (1,693,916,000)       $ (1,698,427,000)          
Aircraft rental expense | Foreign currency forward contract                                
Liabilities                                
Percentage of expense hedged   20.00%