AA 5510 then DL 1577 at Atlanta
Washington National → Atlanta → Memphis
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
21:40DL 1577 to Memphis leaves the gate
22 h 17 apart on the timetable, overnight
DL 1577 leaves 22 h 17 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.