AA 5510 then DL 834 at Atlanta
Washington National → Atlanta → Las Vegas
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
21:52DL 834 to Las Vegas leaves the gate
22 h 29 apart on the timetable, overnight
DL 834 leaves 22 h 29 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.