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Authorization of the consolidated financial statements: (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Consolidated statements of cash flows [Abstract]  
Description of detailed information regarding movements in bank loan and long term debt [Text Block]
As of December 31, 2016 and 2017, the analysis of net debt and movements in net debt is presented below:
 
 
 
Bank
 
Long-term
 
 
 
loans
 
debt
 
 
 
2016
 
2017
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
Accounts payable
 
Ps
 
 
Ps
 
 
Ps
340,288
 
Bank loans (Note 11)
 
 
58,336
 
 
173,471
 
 
 
 
Bank loans (Note 11)
 
 
4,402,440
 
 
10,321,382
 
 
 
 
Long-term debt (Note 12)
 
 
 
 
 
 
 
 
7,149,177
 
 
 
 
 
 
 
 
 
 
 
 
Balances at December 31
 
Ps
4,460,776
 
Ps
10,494,853
 
Ps
7,489,465
 
 
 
 
 
 
 
 
 
 
 
 
Balances at January 1 of net debt
 
Ps
3,678,128
 
Ps
4,460,776
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Acquisition of Aerostar and Airplan
 
 
 
 
 
3,424,897
 
 
7,182,963
 
Interest expense
 
 
126,186
 
 
322,996
 
 
295,834
 
Proceeds from bank loans
 
 
 
 
 
8,000,000
 
 
 
 
Interest paid
 
 
(106,873)
 
 
(351,152)
 
 
(277,068)
 
Payment of the long-term debt and bank loan
 
 
 
 
 
(5,339,338)
 
 
(102,907)
 
Foreign currency translation
 
 
 
 
 
217,385
 
 
390,643
 
Exchange (income) / loss on foreign currency
 
 
763,335
 
 
(240,711)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balances at December 31
 
Ps
4,460,776
 
Ps
10,494,853
 
Ps
7,489,465