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Balances and transactions with related parties: (Tables) | 12 Months Ended
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Dec. 31, 2020
Balances and transactions with related parties: |
Schedule of balances receivable and payable |
|  | December 31,
|  | 2019 |  | 2020
Accounts receivable: |  |  |  |  |  |
Autobuses Golfo Pacífico, S. A. de C. V. (Shareholder/services) |  | Ps. | 284 |  | Ps. | 197
|  | Ps. | 284 |  | Ps. | 197
Accounts payable and accumulated expenses (Note 10):(*) |  |  |  |  |  |
Inversiones y Técnicas Aeroportuarias, S. A. de C. V. |  |  |  |  |  |
(Shareholder/technical assistance) |  | Ps. | (96,769) |  | Ps. | (53,257)
Autobuses de Oriente ADO, S. A. de C. V. |  |  |  |  |  |
(Shareholder/technical assistance) |  |  |  |  |  | (127)
Lava Tap de Chiapas, S. A. de C. V. |  |  |  |  |  |
(Key management personnel/services) |  |  | (543) |  |  | (411)
|  |  | (97,312) |  |  | (53,795)
Net |  | Ps. $ | (97,028) |  | Ps. $ | (53,598)
(*) These are accounts with terms of less than one year under similar market conditions.
Schedule of transactions with related parties |
|  | December 31,
|  | 2018 |  | 2019 |  | 2020
Commercial income: |  |  |  |  |  |  |  |  |
Autobuses de Oriente, S. A. de C. V. (Stockholder) |  | Ps. | 14,455 |  | Ps. | 14,349 |  | Ps. | 7,968
Autobuses Golfo Pacífico, S. A. de C. V. (Stockholder) |  |  | 7,014 |  |  | 7,290 |  |  | 4,862
Coordinados de México de Oriente, S. A. de C. V. (Stockholder) |  |  | 150 |  |  | 157 |  |  | 164
Expenses: |  |  |  |  |  |  |  |  |
Stockholders: |  |  |  |  |  |  |  |  |
Technical assistance (Note 15.4) |  | Ps. | (386,249) |  | Ps. | (404,086) |  | Ps. | (175,615)
Related parties: |  |  |  |  |  |  |  |  |
Administrative services |  |  |  |  |  |  |  |  |
Leasing |  | Ps. | (5,232) |  | Ps. | (5,340) |  | Ps. | (6,061)
Cleaning services |  |  | (10,854) |  |  | (11,544) |  |  | (11,848)
Schedule of compensation of key personnel |
|  | December 31,
|  | 2018 |  | 2019 |  | 2020
Short term salaries and other benefits paid to key personnel (Note 18.17) (*) |  | Ps. | 119,202 |  | Ps. | 109,747 |  | Ps. | 137,272
Fees paid to the Board of Directors and Committees |  |  | 8,695 |  |  | 9,146 |  |  | 8,571
(*) In 2018, 2019 and 2020, includes costs of Ps.53,268, Ps.41,411 and Ps.66,083; and Ps.16,350, Ps.17,381 and Ps.15,650, respectively for key personnel of directors of Aerostar and Airplan.

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