AF 2661 then BA 8384 at San Francisco
Seattle → San Francisco → New York JFK
Timetable, San Francisco time
17:05AF 2661 from Seattle at the gatealso KL 5503
20:55BA 8384 to New York JFK leaves the gate
3 h 50 apart on the timetable
The last days
AF 2661 and BA 8384 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.