AA 597 then VS 1906 at San Francisco
Chicago O'Hare → San Francisco → Seattle
Timetable, San Francisco time
16:19AA 597 from Chicago O'Hare at the gatealso QF 4712
20:58VS 1906 to Seattle leaves the gatealso SK 3106, SK 3470, DL 3991
4 h 39 apart on the timetable
The last days
AA 597 and VS 1906 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.