UA 4456 then UA 4816 at Houston
Baton Rouge → Houston → Huntsville
Timetable, Houston time
06:21UA 4456 from Baton Rouge at the gate
20:04UA 4816 to Huntsville leaves the gate
13 h 43 apart on the timetable
UA 4816 leaves 13 h 43 after UA 4456 arrives on the timetable: more than half a day, so not a connection we count.