UA 3280 then UA 4816 at Houston
Greensboro → Houston → Huntsville
Timetable, Houston time
20:30UA 3280 from Greensboro at the gate
20:04UA 4816 to Huntsville leaves the gate
23 h 34 apart on the timetable, overnight
UA 4816 leaves 23 h 34 after UA 3280 arrives on the timetable: more than half a day, so not a connection we count.