UA 4537 then UA 3754 at Houston
Northwest Arkansas → Houston → Waco
Timetable, Houston time
13:38UA 4537 from Northwest Arkansas at the gate
11:30UA 3754 to Waco leaves the gate
21 h 52 apart on the timetable, overnight
UA 3754 leaves 21 h 52 after UA 4537 arrives on the timetable: more than half a day, so not a connection we count.