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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, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Balance at the beginning |  | $ 34,128,766 | $ 31,882,053 |
Additions |  | 5,253,374 | 6,949,684 |
Disposals |  | (17,742) |  |
Foreign exchange effect |  | 795 |  |
Depreciation on right of use assets | $ (253,098) | (5,048,976) | (4,702,971) | $ (4,043,691)
Balance at the end | $ 1,720,223 | 34,316,217 | 34,128,766 | 31,882,053
Flight equipment |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Balance at the beginning |  | 33,312,089 | 31,126,169 |
Additions |  | 4,876,071 | 6,676,492 |
Disposals |  | (17,742) |  |
Depreciation on right of use assets |  | (4,763,928) | (4,490,572) |
Balance at the end |  | 33,406,490 | 33,312,089 | 31,126,169
Aircraft Spare engines |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Balance at the beginning |  | 677,198 | 579,696 |
Additions |  | 362,081 | 230,200 |
Depreciation on right of use assets |  | (210,079) | (132,698) |
Balance at the end |  | 829,200 | 677,198 | 579,696
Land and building leases |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Balance at the beginning |  | 139,479 | 176,188 |
Additions |  | 15,222 | 42,992 |
Foreign exchange effect |  | 795 |  |
Depreciation on right of use assets |  | (74,969) | (79,701) |
Balance at the end |  | $ 80,527 | $ 139,479 | $ 176,188

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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 2020-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_h&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of disposals of right-of-use assets. + References No definition available. + Details
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- Definition The amount of foreign exchange effect to right-of-use assets. + References No definition available. + Details
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- Details
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- Details
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- Details
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