AA 6274 then AS 620 at San Francisco
Los Angeles → San Francisco → Seattle
Timetable, San Francisco time
09:17AA 6274 from Los Angeles at the gatealso EI 7391
20:58AS 620 to Seattle leaves the gatealso QR 2116, QR 3304
11 h 41 apart on the timetable
The last days
AA 6274 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.