DL 850 then DL 3020 at Atlanta
Washington National → Atlanta → Memphis
Timetable, Atlanta time
20:30DL 850 from Washington National at the gate
19:59DL 3020 to Memphis leaves the gate
23 h 29 apart on the timetable, overnight
DL 3020 leaves 23 h 29 after DL 850 arrives on the timetable: more than half a day, so not a connection we count.