JL 8 then DL 5714 at Boston
Tokyo → Boston → Philadelphia
Timetable, Boston time
17:25JL 8 from Tokyo at the gate
17:21DL 5714 to Philadelphia leaves the gate
23 h 56 apart on the timetable, overnight
DL 5714 leaves 23 h 56 after JL 8 arrives on the timetable: more than half a day, so not a connection we count.