AA 5510 then DL 545 at Atlanta
Washington National → Atlanta → San Francisco
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
20:54DL 545 to San Francisco leaves the gate
21 h 31 apart on the timetable, overnight
DL 545 leaves 21 h 31 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.