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Financial risk management: (Tables) | 12 Months Ended
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Dec. 31, 2020
Financial risk management: |
Schedule of exchange rate risk |
|  | December 31,
|  | 2019 |  | 2020
Monetary position: |  |  |  |  |  |
Asset |  | Ps. | 164,370 |  | Ps. | 88,426
Liability |  |  | (4,853) |  |  | (5,578)
|  | Ps. | 159,517 |  | Ps. | 82,848
Schedule of liquidity position |
December 31, 2019 |  | Cash and equivalents |  | Total Debt |  | Debt term short |  | Debt term long
Mexico |  | Ps. | 4,991,567 |  | Ps. | 3,992,467 |  | Ps. | 23,998 |  | Ps. | 3,968,469
Aerostar |  |  | 698,466 |  |  | 6,799,941 |  |  | 311,372 |  |  | 6,488,569
Airplan |  |  | 502,646 |  |  | 2,920,485 |  |  | 214,237 |  |  | 2,706,248
Total |  | Ps. | 6,192,679 |  | Ps. | 13,712,893 |  | Ps. | 549,607 |  | Ps. | 13,163,286
December 31, 2020 |  | Cash and equivalents |  | Total Debt |  | Debt term short |  | Debt term long
Mexico |  | Ps. | 4,058,495 |  | Ps. | 3,971,210 |  | Ps. | 322,209 |  | Ps. | 3,649,001
Aerostar |  |  | 804,634 |  |  | 7,171,278 |  |  | 529,337 |  |  | 6,641,941
Airplan |  |  | 329,499 |  |  | 2,757,858 |  |  | 287,204 |  |  | 2,470,654
Total |  | Ps. | 5,192,628 |  | Ps. | 13,900,346 |  | Ps. | 1,138,750 |  | Ps. | 12,761,596
Schedule of liquidity risk |
|  | Under |  | Between 3 months |  | Between 1 |  | Between 2 and
At December 31, 2019 |  | 3 months |  | and one year |  | and 2 years |  | 5 years
Bank loans and interest |  | Ps. | 14,639 |  | Ps. | 223,596 |  | Ps. | 228,073 |  | Ps. | 6,446,644
Long term debt |  |  | 111,676 |  |  | 199,696 |  |  | 204,492 |  |  | 6,284,077
Suppliers |  |  | 245,100 |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | 1,378,657 |  |  |  |  |  |  |  |  |
At December 31, 2020 |  |  |  |  |  |  |  |
Bank loans and interest |  | Ps. | 11,176 |  | Ps. | 797,339 |  | Ps. | 2,238,558 |  | Ps. | 3,881,097
Long term debt |  |  | 114,420 |  |  | 215,815 |  |  | 233,123 |  |  | 6,408,818
Suppliers |  |  | 353,806 |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | 1,187,345 |  |  |  |  |  |  |  |  |
Schedule of short term liquidity |
|  | December 31,
|  | 2019 |  | 2020
Current assets |  | Ps. | 7,845,856 |  | Ps. | 7,716,049
Current liabilities |  |  | 2,560,020 |  |  | 2,767,087
Short term position (liquidity) |  | Ps. | 5,285,836 |  | Ps. | 4,948,962

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