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Financial assets and liabilities - Financial assets (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Financial assets      
Total financial assets   $ 532 $ 136,262
Current $ 10 206 133,567
Non-current $ 16 326 2,695
Jet fuel Asian call options contracts      
Financial assets      
Total financial assets   206  
Jet fuel Zero-Cost collars      
Financial assets      
Total financial assets     133,567
Interest rate cap      
Financial assets      
Total financial assets   $ 326 $ 2,695