DL 5697 then DL 5610 at Boston
Richmond → Boston → Philadelphia
Timetable, Boston time
08:00DL 5697 from Richmond at the gate
20:30DL 5610 to Philadelphia leaves the gate
12 h 30 apart on the timetable
DL 5610 leaves 12 h 30 after DL 5697 arrives on the timetable: more than half a day, so not a connection we count.