DL 748 then DL 589 at Atlanta
Las Vegas → Atlanta → Mexico City
Timetable, Atlanta time
19:24DL 748 from Las Vegas at the gate
19:12DL 589 to Mexico City leaves the gate
23 h 48 apart on the timetable, overnight
DL 589 leaves 23 h 48 after DL 748 arrives on the timetable: more than half a day, so not a connection we count.