F9 4409 then DL 850 at Atlanta
Washington → Atlanta → Washington National
Timetable, Atlanta time
23:13F9 4409 from Washington at the gate
15:35DL 850 to Washington National leaves the gate
16 h 22 apart on the timetable, overnight
DL 850 leaves 16 h 22 after F9 4409 arrives on the timetable: more than half a day, so not a connection we count.