DL 599 then DL 3020 at Atlanta
Mexico City → Atlanta → Memphis
Timetable, Atlanta time
20:56DL 599 from Mexico City at the gate
19:59DL 3020 to Memphis leaves the gate
23 h 03 apart on the timetable, overnight
DL 3020 leaves 23 h 03 after DL 599 arrives on the timetable: more than half a day, so not a connection we count.