DL 499 then DL 5620 at Boston
Denver → Boston → Cincinnati
Timetable, Boston time
17:27DL 499 from Denver at the gate
17:00DL 5620 to Cincinnati leaves the gate
23 h 33 apart on the timetable, overnight
DL 5620 leaves 23 h 33 after DL 499 arrives on the timetable: more than half a day, so not a connection we count.