WN 2973 then DL 5665 at Boston
Baltimore → Boston → Richmond
Timetable, Boston time
15:40WN 2973 from Baltimore at the gate
15:23DL 5665 to Richmond leaves the gate
23 h 43 apart on the timetable, overnight
DL 5665 leaves 23 h 43 after WN 2973 arrives on the timetable: more than half a day, so not a connection we count.