UA 539 then UA 3754 at Houston
Dallas-Fort Worth → Houston → Waco
Timetable, Houston time
13:33UA 539 from Dallas-Fort Worth at the gate
11:30UA 3754 to Waco leaves the gate
21 h 57 apart on the timetable, overnight
UA 3754 leaves 21 h 57 after UA 539 arrives on the timetable: more than half a day, so not a connection we count.