DL 5680 then B6 159 at Boston
Pittsburgh → Boston → Philadelphia
Timetable, Boston time
20:47DL 5680 from Pittsburgh at the gate
19:00B6 159 to Philadelphia leaves the gate
22 h 13 apart on the timetable, overnight
B6 159 leaves 22 h 13 after DL 5680 arrives on the timetable: more than half a day, so not a connection we count.