JL 8 then DL 5620 at Boston
Tokyo → Boston → Cincinnati
Timetable, Boston time
17:25JL 8 from Tokyo at the gate
17:00DL 5620 to Cincinnati leaves the gate
23 h 35 apart on the timetable, overnight
DL 5620 leaves 23 h 35 after JL 8 arrives on the timetable: more than half a day, so not a connection we count.