UA 1373 then UA 3754 at Houston
Phoenix → Houston → Waco
Timetable, Houston time
15:15UA 1373 from Phoenix at the gate
11:30UA 3754 to Waco leaves the gate
20 h 15 apart on the timetable, overnight
UA 3754 leaves 20 h 15 after UA 1373 arrives on the timetable: more than half a day, so not a connection we count.