UA 3989 then UA 4307 at Houston
Indianapolis → Houston → Northwest Arkansas
Timetable, Houston time
13:26UA 3989 from Indianapolis at the gate
09:35UA 4307 to Northwest Arkansas leaves the gate
20 h 09 apart on the timetable, overnight
UA 4307 leaves 20 h 09 after UA 3989 arrives on the timetable: more than half a day, so not a connection we count.