UA 2433 then DL 5665 at Boston
Newark → Boston → Richmond
Timetable, Boston time
17:27UA 2433 from Newark at the gate
15:23DL 5665 to Richmond leaves the gate
21 h 56 apart on the timetable, overnight
DL 5665 leaves 21 h 56 after UA 2433 arrives on the timetable: more than half a day, so not a connection we count.