DL 2637 then DL 589 at Atlanta
Nashville → Atlanta → Mexico City
Timetable, Atlanta time
07:37DL 2637 from Nashville at the gate
19:57DL 589 to Mexico City leaves the gate
12 h 20 apart on the timetable
DL 589 leaves 12 h 20 after DL 2637 arrives on the timetable: more than half a day, so not a connection we count.