UA 3903 then B6 616 at San Francisco
Seoul → San Francisco → New York JFK
Timetable, San Francisco time
08:46UA 3903 from Seoul at the gate
22:56B6 616 to New York JFK leaves the gatealso EY 8046, EY 8242, EY 8246, JU 8513
14 h 10 apart on the timetable
B6 616 leaves 14 h 10 after UA 3903 arrives on the timetable: more than half a day, so not a connection we count.