AA 5510 then DL 2501 at Atlanta
Washington National → Atlanta → Memphis
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
22:45DL 2501 to Memphis leaves the gate
23 h 22 apart on the timetable, overnight
DL 2501 leaves 23 h 22 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.