Tex. Alco. Bev. Code § 251.741
In addition to those areas declared wet by order of the commissioners court under the authority of Section 251.74 of this code, in a county with a population of more than 175,000 according to the most recent federal census where the sale of mixed beverages only is legalized in the most populous city in the county by a local option election held after May 18, 1971, the area actually encompassed by any municipal airport under the jurisdiction of that city is wet for the sale of mixed beverages only. Subsequent local option elections held by that city do not affect the local option status of the airport unless the result of the election prohibits the sale of mixed beverages, in which case the provisions of this section do not apply.
Tex. Alco. Bev. Code § 251.741