CA 985 then QF 3748 at San Francisco
Beijing → San Francisco → San Diego
Timetable, San Francisco time
09:30CA 985 from Beijing at the gate
20:00QF 3748 to San Diego leaves the gate
10 h 30 apart on the timetable
The last days
CA 985 and QF 3748 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.