UA 2 then AS 2486 at San Francisco
Singapore → San Francisco → Los Angeles
Timetable, San Francisco time
09:15UA 2 from Singapore at the gate
06:00AS 2486 to Los Angeles leaves the gate
20 h 45 apart on the timetable, overnight
AS 2486 leaves 20 h 45 after UA 2 arrives on the timetable: more than half a day, so not a connection we count.