DL 957 then DL 589 at Atlanta
Denver → Atlanta → Mexico City
Timetable, Atlanta time
19:14DL 957 from Denver at the gate
19:12DL 589 to Mexico City leaves the gate
23 h 58 apart on the timetable, overnight
DL 589 leaves 23 h 58 after DL 957 arrives on the timetable: more than half a day, so not a connection we count.