KE 3470 then UA 8285 at San Francisco
Detroit → San Francisco → Boston
Timetable, San Francisco time
10:29KE 3470 from Detroit at the gatealso MU 8662
22:00UA 8285 to Boston leaves the gate
11 h 31 apart on the timetable
The last days
KE 3470 and UA 8285 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.