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Accounts receivable - Net: (Details 1) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current trade receivables | $ 685,502 | $ 464,872 |
Allowance account for credit losses of financial assets | (127,711) |  |
Allowance account for credit losses of financial assets | (173,398) | (127,711) |
Trade receivables [member] |  |  |
Current trade receivables | 173,398 | 127,711 |
Allowance account for credit losses of financial assets | 127,711 | 128,221 | $ 130,185
Allowance account for credit losses of financial assets | 173,398 | 127,711 | 128,221
Utilisation, allowance account for credit losses of financial assets | 36,621 | (510) | $ (1,964)
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets | 6,690 |  |
Trade receivables [member] | Airplan [Member] |  |  |
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets | 2,376 |  |
Trade receivables [member] | Financial assets past due but not impaired [member] |  |  |
Current trade receivables | 192,805 | 71,317 |
Trade receivables [member] | Not later than one month [member] |  |  |
Current trade receivables | 137,155 | 51,820 |
Trade receivables [member] | Later than three months and not later than six months [member] |  |  |
Current trade receivables | 71,049 | 592 |
Trade receivables [member] | Later than six months and not later than one year [member] |  |  |
Current trade receivables | 157,999 | 146,616 |
Trade receivables [member] | Current [member] |  |  |
Current trade receivables | $ 366,203 | $ 199,028 |

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- Definition The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of current trade receivables. [Refer: Trade receivables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_68&doctype=Standard -URIDate 2017-03-09 + Details
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