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Operating segments (Tables) | 12 Months Ended
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Dec. 31, 2018
Operating segments |
Schedule of geographic segments |
|  | 2018 |  | 2017 |  | 2016
Operating revenues: |  |  |  |  |  |  |  |  |
Domestic (Mexico) |  | Ps. | 18,493,476 |  | Ps. | 17,272,946 |  | Ps. | 15,694,044
International: |  |  |  |  |  |  |  |  |
United States of America and Central America* |  |  | 8,811,674 |  |  | 7,515,240 |  |  | 7,777,516
Total operating revenues |  | Ps. | 27,305,150 |  | Ps. | 24,788,186 |  | Ps. | 23,471,560
*United States of America represents approximately 32%, 30% and 32% of total revenues from external customers in 2018, 2017 and 2016, respectively.

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