UA 858 then AS 2486 at San Francisco
Shanghai → San Francisco → Los Angeles
Timetable, San Francisco time
08:25UA 858 from Shanghai at the gatealso CA 7209
06:00AS 2486 to Los Angeles leaves the gate
21 h 35 apart on the timetable, overnight
AS 2486 leaves 21 h 35 after UA 858 arrives on the timetable: more than half a day, so not a connection we count.