AA 3391 then AA 5335 at Charlotte
Hilton Head → Charlotte → South Bend
Timetable, Charlotte time
17:40AA 3391 from Hilton Head at the gate
15:48AA 5335 to South Bend leaves the gate
22 h 08 apart on the timetable, overnight
AA 5335 leaves 22 h 08 after AA 3391 arrives on the timetable: more than half a day, so not a connection we count.