AA 3166 then B6 1534 at San Francisco
Philadelphia → San Francisco → Boston
Timetable, San Francisco time
19:51AA 3166 from Philadelphia at the gatealso BA 5438
23:35B6 1534 to Boston leaves the gatealso EY 8004
3 h 44 apart on the timetable
The last days
AA 3166 and B6 1534 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.
Later flights to Boston
No later flight to Boston on the timetable.