UA 3911 then KL 7451 at San Francisco
Portland (Oregon) → San Francisco → New York JFK
Timetable, San Francisco time
13:56UA 3911 from Portland (Oregon) at the gate
21:35KL 7451 to New York JFK leaves the gatealso MU 8703
7 h 39 apart on the timetable
The last days
UA 3911 and KL 7451 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.