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Intangible assets, airport concessions and goodwill - Net: - Movements of intangible assets of airport concessions (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Intangible assets: |  |
Intangible assets and goodwill | $ 49,126,038 | $ 49,586,322
Foreign currency translation | 1,321,875 | (1,309,886)
Additions | 1,734,398 |
Additions |  | 849,602
Intangible assets and goodwill | 52,182,311 | 49,126,038
Accumulated amortization |  |
Intangible assets: |  |
Intangible assets and goodwill | 10,395,094 | 8,703,731
Foreign currency translation | (79,297) | 33,462
Additions | (1,849,871) | (1,770,613)
Intangible assets and goodwill | (14,061,413) | 10,395,094
Concessions (Regulated Activity) |  |
Intangible assets: |  |
Intangible assets and goodwill | 50,586,636 | 49,961,253
Foreign currency translation | 1,059,370 | (961,446)
Additions | 107,144 | 591,315
Disposals transfers | 932,376 | 995,514
Intangible assets and goodwill | 52,685,526 | 50,586,636
Contracts assets |  |
Intangible assets: |  |
Intangible assets and goodwill | 978,060 | 671,496
Foreign currency translation | 1,295 |
Additions | 3,036,386 | 1,236,196
Disposals transfers | (311,676) | (929,632)
Intangible assets and goodwill | 3,704,065 | 978,060
Contractor advance |  |
Intangible assets: |  |
Intangible assets and goodwill | 696,696 |
Additions | 355,809 | 762,578
Disposals transfers | (620,700) | (65,882)
Intangible assets and goodwill | 431,805 | 696,696
Licences and ODC |  |
Intangible assets: |  |
Intangible assets and goodwill | 279,797 | 249,671
Additions | 84,930 | 30,126
Intangible assets and goodwill | 364,727 | 279,797
Commercial Right's (Unregulated Activity) |  |
Intangible assets: |  |
Intangible assets and goodwill | 6,149,729 | 6,531,631
Foreign currency translation | 340,507 | (381,902)
Intangible assets and goodwill | 6,490,236 | 6,149,729
Goodwill | Gross carrying amount |  |
Intangible assets: |  |
Intangible assets and goodwill | 2,567,365 | 2,567,365
Intangible assets and goodwill | $ 2,567,365 | $ 2,567,365

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