UA 3941 then VA 8546 at San Francisco
Washington → San Francisco → Los Angeles
Timetable, San Francisco time
14:07UA 3941 from Washington at the gate
06:00VA 8546 to Los Angeles leaves the gate
15 h 53 apart on the timetable, overnight
VA 8546 leaves 15 h 53 after UA 3941 arrives on the timetable: more than half a day, so not a connection we count.