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Leases - Carrying amounts of right-of use assets (Details) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Balance at the beginning |  | $ 31,882,053 | $ 24,893,882 | $ 23,500,081
Additions |  | 6,949,684 | 11,031,862 | 4,831,704
Depreciation on right of use assets | $ (249,558) | (4,702,971) | (4,043,691) | (3,437,903)
Balance at the end | $ 1,811,006 | 34,128,766 | 31,882,053 | 24,893,882
Flight equipment |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Balance at the beginning |  | 31,126,169 | 24,406,960 | 23,047,879
Additions |  | 6,676,492 | 10,585,188 | 4,665,330
Depreciation on right of use assets |  | (4,490,572) | (3,865,979) | (3,306,249)
Balance at the end |  | 33,312,089 | 31,126,169 | 24,406,960
Aircraft spare engines |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Balance at the beginning |  | 579,696 | 300,029 | 220,554
Additions |  | 230,200 | 387,480 | 157,225
Depreciation on right of use assets |  | (132,698) | (107,813) | (77,750)
Balance at the end |  | 677,198 | 579,696 | 300,029
Land and buildings |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Balance at the beginning |  | 176,188 | 186,893 | 231,648
Additions |  | 42,992 | 59,194 | 9,149
Depreciation on right of use assets |  | (79,701) | (69,899) | (53,904)
Balance at the end |  | $ 139,479 | $ 176,188 | $ 186,893

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_h&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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- Details
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