UA 3903 then DL 670 at San Francisco
Seoul → San Francisco → New York JFK
Timetable, San Francisco time
08:46UA 3903 from Seoul at the gate
23:05DL 670 to New York JFK leaves the gatealso AM 4305, SV 4360, VS 4848, LA 6189, KQ 7055
14 h 19 apart on the timetable
DL 670 leaves 14 h 19 after UA 3903 arrives on the timetable: more than half a day, so not a connection we count.