AA 5510 then DL 818 at Atlanta
Washington National → Atlanta → Dallas-Fort Worth
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
22:50DL 818 to Dallas-Fort Worth leaves the gate
23 h 27 apart on the timetable, overnight
DL 818 leaves 23 h 27 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.