AC 4531 then UA 930 at San Francisco
Sacramento → San Francisco → London
Timetable, San Francisco time
18:57AC 4531 from Sacramento at the gate
16:40UA 930 to London leaves the gatealso LX 3049, AC 5376, OS 7858, SN 9100, LH 9379
21 h 43 apart on the timetable, overnight
UA 930 leaves 21 h 43 after AC 4531 arrives on the timetable: more than half a day, so not a connection we count.