AA 5510 then DL 1351 at Atlanta
Washington National → Atlanta → Pittsburgh
Timetable, Atlanta time
23:23AA 5510 from Washington National at the gate
23:05DL 1351 to Pittsburgh leaves the gate
23 h 42 apart on the timetable, overnight
DL 1351 leaves 23 h 42 after AA 5510 arrives on the timetable: more than half a day, so not a connection we count.