UA 423 then UA 3754 at Houston
Philadelphia → Houston → College Station
Timetable, Houston time
15:29UA 423 from Philadelphia at the gate
10:00UA 3754 to College Station leaves the gate
18 h 31 apart on the timetable, overnight
UA 3754 leaves 18 h 31 after UA 423 arrives on the timetable: more than half a day, so not a connection we count.