AA 4570 then DL 5634 at Boston
Washington National → Boston → Pittsburgh
Timetable, Boston time
14:42AA 4570 from Washington National at the gate
14:15DL 5634 to Pittsburgh leaves the gate
23 h 33 apart on the timetable, overnight
DL 5634 leaves 23 h 33 after AA 4570 arrives on the timetable: more than half a day, so not a connection we count.