AA 3865 then AA 5543 at Charlotte
Hilton Head → Charlotte → Pittsburgh
Timetable, Charlotte time
13:44AA 3865 from Hilton Head at the gate
08:35AA 5543 to Pittsburgh leaves the gate
18 h 51 apart on the timetable, overnight
AA 5543 leaves 18 h 51 after AA 3865 arrives on the timetable: more than half a day, so not a connection we count.