UA 6138 then AA 5135 at Charlotte
Houston → Charlotte → Charleston (South Carolina)
Timetable, Charlotte time
15:54UA 6138 from Houston at the gate
15:44AA 5135 to Charleston (South Carolina) leaves the gate
23 h 50 apart on the timetable, overnight
AA 5135 leaves 23 h 50 after UA 6138 arrives on the timetable: more than half a day, so not a connection we count.