DL 1007 then WN 3553 at Atlanta
Washington National → Atlanta → Pittsburgh
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
16:30WN 3553 to Pittsburgh leaves the gate
18 h 49 apart on the timetable, overnight
WN 3553 leaves 18 h 49 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.