DL 5731 then DL 5665 at Boston
Pittsburgh → Boston → Richmond
Timetable, Boston time
16:37DL 5731 from Pittsburgh at the gate
15:20DL 5665 to Richmond leaves the gate
22 h 43 apart on the timetable, overnight
DL 5665 leaves 22 h 43 after DL 5731 arrives on the timetable: more than half a day, so not a connection we count.