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Fair value measurements - Carrying amount and fair value (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair value measurements    
Carrying amount of derivative financial assets $ 532 $ 136,262
Fair value of derivative financial assets 532 136,262
Fair value of financial liabilities (9,657)  
Net carrying amount (5,359,737) (4,872,247)
Net fair value (5,536,457) (5,058,054)
Transfers of assets from level 1 to level 2 0  
Transfers of assets from level 2 to level 1 0  
Transfers of liabilities from level 1 to level 2   0
Transfers of liabilities from level 2 to level 1   0
Financial debt    
Fair value measurements    
Carrying amount of financial liabilities (5,350,612) (5,008,509)
Fair value of financial liabilities (5,527,332) (5,194,316)
Interest-bearing loans and borrowings    
Fair value measurements    
Fair value of financial liabilities (5,527,332) (5,194,316)
Non derivative financial instruments    
Fair value measurements    
Carrying amount of financial liabilities (9,657)  
Fair value of financial liabilities (9,657)  
Jet fuel Asian call options contracts    
Fair value measurements    
Carrying amount of derivative financial assets 206  
Fair value of derivative financial assets 206 133,567
Interest rate Cap    
Fair value measurements    
Fair value of derivative financial assets 326 2,695
Level 2    
Fair value measurements    
Fair value of financial liabilities (9,657)  
Net fair value (5,536,457) (5,058,054)
Level 2 | Interest-bearing loans and borrowings    
Fair value measurements    
Fair value of financial liabilities (5,527,332) (5,194,316)
Level 2 | Jet fuel Asian call options contracts    
Fair value measurements    
Fair value of derivative financial assets 206 133,567
Level 2 | Interest rate Cap    
Fair value measurements    
Fair value of derivative financial assets $ 326 $ 2,695