UA 5580 then UA 3754 at Houston
Corpus Christi → Houston → Waco
Timetable, Houston time
15:01UA 5580 from Corpus Christi at the gate
11:30UA 3754 to Waco leaves the gate
20 h 29 apart on the timetable, overnight
UA 3754 leaves 20 h 29 after UA 5580 arrives on the timetable: more than half a day, so not a connection we count.