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Fair value measurements - Carrying amount and fair value (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair value measurements      
Carrying amount of derivative financial assets $ 136,262 $ 62,440 $ 497,403
Fair value of derivative financial assets 136,262 62,440 497,403
Net carrying amount (4,872,247) (3,567,342) (2,979,339)
Net fair value (5,058,054) (3,576,058) (2,984,338)
Transfers of assets from level 1 to level 2 0 0 0
Transfers of assets from level 2 to level 1 0 0 0
Transfers of liabilities from level 1 to level 2 0 0 0
Transfers of liabilities from level 2 to level 1 0 0 0
Financial debt      
Fair value measurements      
Carrying amount of financial liabilities (5,008,509) (3,506,834) (3,476,742)
Fair value of financial liabilities (5,194,316) (3,515,550) (3,481,741)
Interest-bearing loans and borrowings      
Fair value measurements      
Fair value of financial liabilities (5,194,316) (3,515,550) (3,481,741)
Derivative financial instruments      
Fair value measurements      
Carrying amount of financial liabilities   (122,948)  
Fair value of financial liabilities   (122,948)  
Jet fuel Asian call options      
Fair value measurements      
Carrying amount of derivative financial assets   48,199 497,403
Fair value of derivative financial assets 133,567 48,199 497,403
Fair value of financial liabilities   (122,948)  
Foreign currency forward contract      
Fair value measurements      
Carrying amount of derivative financial assets   14,241  
Fair value of derivative financial assets   14,241  
Loss of the interest rate Cap      
Fair value measurements      
Fair value of derivative financial assets 2,695    
Level 2      
Fair value measurements      
Net fair value (5,058,054) (3,576,058) (2,984,338)
Level 2 | Interest-bearing loans and borrowings      
Fair value measurements      
Fair value of financial liabilities (5,194,316) (3,515,550) (3,481,741)
Level 2 | Jet fuel Asian call options      
Fair value measurements      
Fair value of derivative financial assets 133,567 48,199 $ 497,403
Fair value of financial liabilities   (122,948)  
Level 2 | Foreign currency forward contract      
Fair value measurements      
Fair value of derivative financial assets   $ 14,241  
Level 2 | Loss of the interest rate Cap      
Fair value measurements      
Fair value of derivative financial assets $ 2,695