DL 5731 then DL 5676 at Boston
Pittsburgh → Boston → Richmond
Timetable, Boston time
18:44DL 5731 from Pittsburgh at the gate
18:10DL 5676 to Richmond leaves the gate
23 h 26 apart on the timetable, overnight
DL 5676 leaves 23 h 26 after DL 5731 arrives on the timetable: more than half a day, so not a connection we count.