DFW is a LONG way from San Antonio, and in the wrong direction. If I were to take a wild guess, I'd say the South Texas Nuclear Project was the ultimate destination, near Palacios (which is still a pretty far piece from San Antonio). Within the city, there's also a little biomedical research going on at UTSA Medical Science Center, South Texas Medical Center, Southwest Primate Reserach Center, Lackland AFB, and (perhaps?) Southwest Research Institute.
I don't get the primate center angle unless they're trying to line up dates with more body hair than they have.
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It would not surprise me if they were headed for Dallas/Ft. Worth airport.