B6 1236 then DL 5622 at Boston
Detroit → Boston → Richmond
Timetable, Boston time
09:39B6 1236 from Detroit at the gate
08:50DL 5622 to Richmond leaves the gate
23 h 11 apart on the timetable, overnight
DL 5622 leaves 23 h 11 after B6 1236 arrives on the timetable: more than half a day, so not a connection we count.