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Summary of the main accounting policies: (Details 2) | 12 Months Ended
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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

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- Definition The useful lives or amortisation rates used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_a&doctype=Standard -URIDate 2017-03-09 + Details
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