AA 5510 then DL 589 at Atlanta
Washington National → Atlanta → Mexico City
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
19:08DL 589 to Mexico City leaves the gate
19 h 45 apart on the timetable, overnight
DL 589 leaves 19 h 45 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.