AA 3391 then AA 3686 at Charlotte
Hilton Head → Charlotte → Greensboro
Timetable, Charlotte time
17:40AA 3391 from Hilton Head at the gate
16:56AA 3686 to Greensboro leaves the gate
23 h 16 apart on the timetable, overnight
AA 3686 leaves 23 h 16 after AA 3391 arrives on the timetable: more than half a day, so not a connection we count.