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Summary of the main accounting policies: (Details 2)
12 Months Ended
Dec. 31, 2017
Licences and franchises [member]  
Useful lives or amortisation rates, intangible assets other than goodwill 31 Years
ODC [Member]  
Useful lives or amortisation rates, intangible assets other than goodwill 31 Years
Commercial Rights [Member] | Aerostars [Member]  
Useful lives or amortisation rates, intangible assets other than goodwill 36 Years
Commercial Rights [Member] | Airplan [Member]  
Useful lives or amortisation rates, intangible assets other than goodwill 15 Years