KE 3643 then KL 7451 at San Francisco
Atlanta → San Francisco → New York JFK
Timetable, San Francisco time
10:26KE 3643 from Atlanta at the gatealso MU 8849
20:50KL 7451 to New York JFK leaves the gate
10 h 24 apart on the timetable
The last days
KE 3643 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.