AA 3166 then AS 620 at San Francisco
Philadelphia → San Francisco → Seattle
Timetable, San Francisco time
19:51AA 3166 from Philadelphia at the gatealso BA 5438
20:58AS 620 to Seattle leaves the gatealso QR 2116, QR 3304
1 h 07 apart on the timetable
The last days
AA 3166 and AS 620 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.