AA 5510 then DL 819 at Atlanta
Washington National → Atlanta → San Diego
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
19:23DL 819 to San Diego leaves the gate
20 h apart on the timetable, overnight
DL 819 leaves 20 h after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.