F9 4409 then DL 3122 at Atlanta
Washington → Atlanta → Pittsburgh
Timetable, Atlanta time
20:27F9 4409 from Washington at the gate
17:08DL 3122 to Pittsburgh leaves the gate
20 h 41 apart on the timetable, overnight
DL 3122 leaves 20 h 41 after F9 4409 arrives on the timetable: more than half a day, so not a connection we count.