B6 916 then DL 5665 at Boston
Buffalo → Boston → Richmond
Timetable, Boston time
15:58B6 916 from Buffalo at the gate
15:35DL 5665 to Richmond leaves the gate
23 h 37 apart on the timetable, overnight
DL 5665 leaves 23 h 37 after B6 916 arrives on the timetable: more than half a day, so not a connection we count.