AA 3391 then AA 1740 at Charlotte
Hilton Head → Charlotte → San Diego
Timetable, Charlotte time
17:40AA 3391 from Hilton Head at the gate
16:51AA 1740 to San Diego leaves the gate
23 h 11 apart on the timetable, overnight
AA 1740 leaves 23 h 11 after AA 3391 arrives on the timetable: more than half a day, so not a connection we count.