AA 2443 then B6 833 at Boston
Philadelphia → Boston → San Francisco
Timetable, Boston time
10:18AA 2443 from Philadelphia at the gate
17:05B6 833 to San Francisco leaves the gate
6 h 47 apart on the timetable
The last days
AA 2443 and B6 833 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.