DL 8838 then DL 589 at Atlanta
Memphis → Atlanta → Mexico City
Timetable, Atlanta time
07:28DL 8838 from Memphis at the gate
19:57DL 589 to Mexico City leaves the gate
12 h 29 apart on the timetable
DL 589 leaves 12 h 29 after DL 8838 arrives on the timetable: more than half a day, so not a connection we count.