AA 5551 then AA 5215 at Philadelphia
Northwest Arkansas → Philadelphia → Harrisburg
Timetable, Philadelphia time
09:50AA 5551 from Northwest Arkansas at the gate
08:20AA 5215 to Harrisburg leaves the gate
22 h 30 apart on the timetable, overnight
AA 5215 leaves 22 h 30 after AA 5551 arrives on the timetable: more than half a day, so not a connection we count.