B6 817 then DL 4659 at JFK
Boston → New York → Richmond
Timetable, New York time
19:59B6 817 from Boston at the gate
19:45DL 4659 to Richmond leaves the gate
23 h 46 apart on the timetable, overnight
DL 4659 leaves 23 h 46 after B6 817 arrives on the timetable: more than half a day, so not a connection we count.