DL 5680 then AA 4743 at Boston
Pittsburgh → Boston → Buffalo
Timetable, Boston time
20:47DL 5680 from Pittsburgh at the gate
19:50AA 4743 to Buffalo leaves the gate
23 h 03 apart on the timetable, overnight
AA 4743 leaves 23 h 03 after DL 5680 arrives on the timetable: more than half a day, so not a connection we count.