AA 1577 then AA 5437 at Philadelphia
Charleston (South Carolina) → Philadelphia → Washington National
Timetable, Philadelphia time
07:49AA 1577 from Charleston (South Carolina) at the gate
20:48AA 5437 to Washington National leaves the gate
12 h 59 apart on the timetable
AA 5437 leaves 12 h 59 after AA 1577 arrives on the timetable: more than half a day, so not a connection we count.