AA 5510 then DL 1283 at Atlanta
Washington National → Atlanta → Harrisburg
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
21:59DL 1283 to Harrisburg leaves the gate
22 h 36 apart on the timetable, overnight
DL 1283 leaves 22 h 36 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.