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Going to PIT (T-6, I assume?) in the winter, you'll get plenty of weather days.
As such, you'll get familiar with Taco Sensations, just about 1/4 mile out the main gate, for your breakfast taco needs.
Mi Tierra Mexican Cafe (Downtown SA near the Riverwalk) is open 24 hours. You will end up there after the bars close. Don't be afraid of the life size painting/shrine of Selena.