AA 5510 then DL 903 at Atlanta
Washington National → Atlanta → Seattle
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
21:20DL 903 to Seattle leaves the gate
21 h 57 apart on the timetable, overnight
DL 903 leaves 21 h 57 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.