UA 3989 then UA 3754 at Houston
Indianapolis → Houston → Waco
Timetable, Houston time
13:26UA 3989 from Indianapolis at the gate
11:30UA 3754 to Waco leaves the gate
22 h 04 apart on the timetable, overnight
UA 3754 leaves 22 h 04 after UA 3989 arrives on the timetable: more than half a day, so not a connection we count.