B6 8378 then DL 5622 at Boston
Las Vegas → Boston → Richmond
Timetable, Boston time
09:19B6 8378 from Las Vegas at the gate
08:50DL 5622 to Richmond leaves the gate
23 h 31 apart on the timetable, overnight
DL 5622 leaves 23 h 31 after B6 8378 arrives on the timetable: more than half a day, so not a connection we count.