AA 5510 then DL 1104 at Atlanta
Washington National → Atlanta → Dallas
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
21:20DL 1104 to Dallas leaves the gate
21 h 57 apart on the timetable, overnight
DL 1104 leaves 21 h 57 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.