UA 3634 then AA 3244 at Charlotte
Washington → Charlotte → Myrtle Beach
Timetable, Charlotte time
10:42UA 3634 from Washington at the gate
22:55AA 3244 to Myrtle Beach leaves the gate
12 h 13 apart on the timetable
AA 3244 leaves 12 h 13 after UA 3634 arrives on the timetable: more than half a day, so not a connection we count.