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Costs and expenses by nature: (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Costs and expenses by nature: |  |  |
Short term benefits | $ 1,167,302 | $ 1,039,883 | $ 1,199,217
Electric power | 419,909 | 382,026 | 474,719
Maintenance and conservation | 611,274 | 447,884 | 699,557
Professional fees | 225,321 | 251,621 | 308,740
Insurance and bonds | 227,342 | 127,750 | 225,252
Surveillance services | 294,807 | 275,206 | 325,613
Cleaning services | 209,447 | 207,599 | 232,219
Technical assistance | 391,698 | 175,615 | 404,086
Right of use of assets under concession | 948,062 | 535,379 | 986,850
Amortization and depreciation of intangible assets, furniture and equipment | 1,993,342 | 1,934,766 | 1,836,897
Consumption of commercial items | 333,192 | 169,298 | 323,899
Construction services | 3,146,166 | 3,657,086 | 1,236,193
Termination benefits | 2,866 | 2,382 | 1,922
Employees' statutory profit sharing | 84,670 | 3,115 | 10,250
Impairment of accounts receivable | 9,331 | 154,417 | 12,127
Other | 62,258 | 143,409 | 267,521
Total aeronautical and non-aeronautical services costs, costs of construction services and administrative expenses | $ 10,126,987 | $ 9,507,436 | $ 8,545,062

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- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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