AA 3857 then DL 5634 at Boston
Syracuse → Boston → Pittsburgh
Timetable, Boston time
14:27AA 3857 from Syracuse at the gate
14:15DL 5634 to Pittsburgh leaves the gate
23 h 48 apart on the timetable, overnight
DL 5634 leaves 23 h 48 after AA 3857 arrives on the timetable: more than half a day, so not a connection we count.