UA 1503 then UA 3754 at Houston
Puerto Vallarta → Houston → Waco
Timetable, Houston time
14:08UA 1503 from Puerto Vallarta at the gate
11:30UA 3754 to Waco leaves the gate
21 h 22 apart on the timetable, overnight
UA 3754 leaves 21 h 22 after UA 1503 arrives on the timetable: more than half a day, so not a connection we count.