UA 3236 then UA 697 at Houston
Mc Allen → Houston → San Antonio
Timetable, Houston time
20:10UA 3236 from Mc Allen at the gate
14:30UA 697 to San Antonio leaves the gate
18 h 20 apart on the timetable, overnight
UA 697 leaves 18 h 20 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.