AA 3186 then DL 5634 at Boston
Philadelphia → Boston → Pittsburgh
Timetable, Boston time
14:37AA 3186 from Philadelphia at the gate
14:15DL 5634 to Pittsburgh leaves the gate
23 h 38 apart on the timetable, overnight
DL 5634 leaves 23 h 38 after AA 3186 arrives on the timetable: more than half a day, so not a connection we count.