UA 1980 then UA 3754 at Houston
San Diego → Houston → Waco
Timetable, Houston time
15:33UA 1980 from San Diego at the gate
11:30UA 3754 to Waco leaves the gate
19 h 57 apart on the timetable, overnight
UA 3754 leaves 19 h 57 after UA 1980 arrives on the timetable: more than half a day, so not a connection we count.