AA 9781 then AA 1597 at Philadelphia
New York LaGuardia → Philadelphia → Charleston (South Carolina)
Timetable, Philadelphia time
06:00AA 9781 from New York LaGuardia at the gate
18:37AA 1597 to Charleston (South Carolina) leaves the gate
12 h 37 apart on the timetable
AA 1597 leaves 12 h 37 after AA 9781 arrives on the timetable: more than half a day, so not a connection we count.