AS 1456 then KL 7451 at San Francisco
Los Angeles → San Francisco → New York JFK
Timetable, San Francisco time
10:43AS 1456 from Los Angeles at the gatealso DE 5011
20:50KL 7451 to New York JFK leaves the gate
10 h 07 apart on the timetable
The last days
AS 1456 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.