UA 3852 then B6 116 at San Francisco
Seoul → San Francisco → New York JFK
Timetable, San Francisco time
08:46UA 3852 from Seoul at the gate
06:00B6 116 to New York JFK leaves the gatealso TP 4390, KQ 7278, FI 7888, EY 8021, EY 8035, EY 8348, AT 9557
21 h 14 apart on the timetable, overnight
B6 116 leaves 21 h 14 after UA 3852 arrives on the timetable: more than half a day, so not a connection we count.