B6 633 then UA 1164 at San Francisco
Boston → San Francisco → Los Angeles
Timetable, San Francisco time
09:59B6 633 from Boston at the gate
10:25UA 1164 to Los Angeles leaves the gate
26 min apart on the timetable
The last days
B6 633 and UA 1164 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.