UA 3280 then UA 323 at Houston
Greensboro → Houston → Oklahoma City
Timetable, Houston time
20:30UA 3280 from Greensboro at the gate
16:30UA 323 to Oklahoma City leaves the gate
20 h apart on the timetable, overnight
UA 323 leaves 20 h after UA 3280 arrives on the timetable: more than half a day, so not a connection we count.