B6 2120 then DL 5714 at Boston
San Diego → Boston → Philadelphia
Timetable, Boston time
04:53B6 2120 from San Diego at the gate
17:25DL 5714 to Philadelphia leaves the gate
12 h 32 apart on the timetable
DL 5714 leaves 12 h 32 after B6 2120 arrives on the timetable: more than half a day, so not a connection we count.