UA 3852 then AF 6853 at San Francisco
Seoul → San Francisco → New York JFK
Timetable, San Francisco time
08:46UA 3852 from Seoul at the gate
07:00AF 6853 to New York JFK leaves the gate
22 h 14 apart on the timetable, overnight
AF 6853 leaves 22 h 14 after UA 3852 arrives on the timetable: more than half a day, so not a connection we count.