UA 1072 then UA 3754 at Houston
Silao → Houston → Waco
Timetable, Houston time
14:54UA 1072 from Silao at the gate
11:30UA 3754 to Waco leaves the gate
20 h 36 apart on the timetable, overnight
UA 3754 leaves 20 h 36 after UA 1072 arrives on the timetable: more than half a day, so not a connection we count.