UA 3852 then AS 345 at San Francisco
Seoul → San Francisco → Los Angeles
Timetable, San Francisco time
08:46UA 3852 from Seoul at the gate
06:40AS 345 to Los Angeles leaves the gatealso QR 2193, TN 2322
21 h 54 apart on the timetable, overnight
AS 345 leaves 21 h 54 after UA 3852 arrives on the timetable: more than half a day, so not a connection we count.