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Operating segments (Tables) | 12 Months Ended
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Dec. 31, 2017
Operating segments |
Schedule of geographic segments |
|  | 2017 |  | 2016 |  | 2015 |
Operating revenues: |  |  |  |  |  |  |
Domestic (Mexico) |  | Ps. | 17,313,740 |  | Ps. | 15,720,807 |  | Ps. | 12,579,806 |
International: |  |  |  |  |  |  |
United States of America and Central America* |  | 7,531,635 |  | 7,791,644 |  | 5,599,898 |
Total operating revenues |  | Ps. | 24,845,375 |  | Ps. | 23,512,451 |  | Ps. | 18,179,704 |
*United States of America represents approximately 29%, 32% and 31% of total revenues from external customers in 2017, 2016 and 2015, respectively.

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