UA 1598 then DL 5665 at Boston
Newark → Boston → Richmond
Timetable, Boston time
15:50UA 1598 from Newark at the gate
15:20DL 5665 to Richmond leaves the gate
23 h 30 apart on the timetable, overnight
DL 5665 leaves 23 h 30 after UA 1598 arrives on the timetable: more than half a day, so not a connection we count.