UA 3634 then AA 6065 at Charlotte
Washington → Charlotte → Huntsville
Timetable, Charlotte time
10:42UA 3634 from Washington at the gate
22:50AA 6065 to Huntsville leaves the gate
12 h 08 apart on the timetable
AA 6065 leaves 12 h 08 after UA 3634 arrives on the timetable: more than half a day, so not a connection we count.