MS 9321 then UA 8159 at San Francisco
Washington → San Francisco → San Diego
Timetable, San Francisco time
12:25MS 9321 from Washington at the gate
15:25UA 8159 to San Diego leaves the gate
3 h apart on the timetable
The last days
MS 9321 and UA 8159 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.