AA 1731 then AS 620 at San Francisco
Dallas-Fort Worth → San Francisco → Seattle
Timetable, San Francisco time
15:10AA 1731 from Dallas-Fort Worth at the gatealso QR 2239, QR 2719, QF 4747
20:58AS 620 to Seattle leaves the gatealso QR 2116, QR 3304
5 h 48 apart on the timetable
The last days
AA 1731 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.