F9 4409 then WN 3553 at Atlanta
Washington → Atlanta → Pittsburgh
Timetable, Atlanta time
23:13F9 4409 from Washington at the gate
16:30WN 3553 to Pittsburgh leaves the gate
17 h 17 apart on the timetable, overnight
WN 3553 leaves 17 h 17 after F9 4409 arrives on the timetable: more than half a day, so not a connection we count.