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Balances and transactions with related parties: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts receivable:    
Receivables due from related parties $ 809 $ 437
(*) Accounts payable and accumulated expenses (Note 10):    
Payables to related parties (97,332) (87,951)
Trade and other receivables payables to related parties (96,523) (87,514)
Autobuses Golfo Pacífico, S. A. de C. V [member]    
Accounts receivable:    
Receivables due from related parties 271 390
Lava Tap de Chiapas, S. A. de C. V. [member]    
(*) Accounts payable and accumulated expenses (Note 10):    
Payables to related parties (689) (1,047)
Inversiones y Tecnicas Aeroportuarias, S. A. de C. V. [member]    
(*) Accounts payable and accumulated expenses (Note 10):    
Payables to related parties [1] (96,643) (82,771)
Sociedad Operadora Airplan S A [Member]    
(*) Accounts payable and accumulated expenses (Note 10):    
Payables to related parties   (4,133)
Autobuses de Oriente ADO S A de C V [Member]    
Accounts receivable:    
Receivables due from related parties $ 538 $ 47
[1] These are accounts with terms of less than one year under similar market conditions.