DL 1978 then DL 589 at Atlanta
Santa Clara → Atlanta → Mexico City
Timetable, Atlanta time
19:13DL 1978 from Santa Clara at the gate
19:08DL 589 to Mexico City leaves the gate
23 h 55 apart on the timetable, overnight
DL 589 leaves 23 h 55 after DL 1978 arrives on the timetable: more than half a day, so not a connection we count.