F9 4409 then DL 834 at Atlanta
Washington → Atlanta → Las Vegas
Timetable, Atlanta time
23:13F9 4409 from Washington at the gate
21:52DL 834 to Las Vegas leaves the gate
22 h 39 apart on the timetable, overnight
DL 834 leaves 22 h 39 after F9 4409 arrives on the timetable: more than half a day, so not a connection we count.