DL 539 then DL 589 at Atlanta
Portland (Oregon) → Atlanta → Mexico City
Timetable, Atlanta time
19:27DL 539 from Portland (Oregon) at the gate
19:12DL 589 to Mexico City leaves the gate
23 h 45 apart on the timetable, overnight
DL 589 leaves 23 h 45 after DL 539 arrives on the timetable: more than half a day, so not a connection we count.