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Components of other comprehensive income (loss) (Details) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Derivative financial instruments: |  |  |  |
Reclassification of call options and forwards during the year to profit or loss (Note 4) |  | $ (455,009) | $ 52,097 | $ 353,943
Net gain (loss) on cash flow hedges | $ (14,413) | (283,691) | (42,148) | 624,694
Jet fuel Asian call options |  |  |  |
Derivative financial instruments: |  |  |  |
Gains (losses) on cash flow hedges, before tax |  | 227,509 | (81,182) | 277,899
Net gain (loss) on cash flow hedges |  | (174,984) | (54,202) | 583,065
Jet fuel Zero cost collars |  |  |  |
Derivative financial instruments: |  |  |  |
Gains (losses) on cash flow hedges, before tax |  | (122,948) |  |
Net gain (loss) on cash flow hedges |  | (122,948) |  |
Foreign currency forward contract |  |  |  |
Derivative financial instruments: |  |  |  |
Gains (losses) on cash flow hedges, before tax |  | $ 66,757 | (13,380) |
Interest rate swap contracts |  |  |  |
Derivative financial instruments: |  |  |  |
Gains (losses) on cash flow hedges, before tax |  |  | 317 | (7,148)
Net gain (loss) on cash flow hedges |  |  | $ 14,144 | $ 41,629

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- Definition The amount of other comprehensive income, before tax, related to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income, before tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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