UA 1081 then UA 3754 at Houston
Cancún → Houston → Waco
Timetable, Houston time
14:03UA 1081 from Cancún at the gate
11:30UA 3754 to Waco leaves the gate
21 h 27 apart on the timetable, overnight
UA 3754 leaves 21 h 27 after UA 1081 arrives on the timetable: more than half a day, so not a connection we count.