DL 400 then DL 5665 at Boston
San Francisco → Boston → Richmond
Timetable, Boston time
15:30DL 400 from San Francisco at the gate
15:20DL 5665 to Richmond leaves the gate
23 h 50 apart on the timetable, overnight
DL 5665 leaves 23 h 50 after DL 400 arrives on the timetable: more than half a day, so not a connection we count.