DL 2599 then DL 2501 at Atlanta
Madison → Atlanta → Memphis
Timetable, Atlanta time
22:59DL 2599 from Madison at the gate
22:45DL 2501 to Memphis leaves the gate
23 h 46 apart on the timetable, overnight
DL 2501 leaves 23 h 46 after DL 2599 arrives on the timetable: more than half a day, so not a connection we count.