B6 1534 then DL 8922 at Boston
San Francisco → Boston → Philadelphia
Timetable, Boston time
07:09B6 1534 from San Francisco at the gate
14:00DL 8922 to Philadelphia leaves the gate
6 h 51 apart on the timetable
The last days
B6 1534 and DL 8922 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.