AA 7537 then UA 436 at San Francisco
Seattle → San Francisco → Ontario
Timetable, San Francisco time
09:41AA 7537 from Seattle at the gate
16:35UA 436 to Ontario leaves the gate
6 h 54 apart on the timetable
The last days
AA 7537 and UA 436 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.