B6 778 then DL 5714 at Boston
Las Vegas → Boston → Philadelphia
Timetable, Boston time
05:00B6 778 from Las Vegas at the gate
17:25DL 5714 to Philadelphia leaves the gate
12 h 25 apart on the timetable
DL 5714 leaves 12 h 25 after B6 778 arrives on the timetable: more than half a day, so not a connection we count.