UA 3852 then DL 405 at San Francisco
Seoul → San Francisco → New York JFK
Timetable, San Francisco time
08:46UA 3852 from Seoul at the gate
07:00DL 405 to New York JFK leaves the gatealso UX 3427, SK 3637, AM 4304, SV 4362, LY 4442, VS 4838, LA 5464, KL 5640, LA 6105, LA 6174, LA 6218, LA 6305, LA 7017, LA 7062, LA 7067, LA 8948, LA 8971
22 h 14 apart on the timetable, overnight
DL 405 leaves 22 h 14 after UA 3852 arrives on the timetable: more than half a day, so not a connection we count.