AC 4531 then BA 284 at San Francisco
Sacramento → San Francisco → London
Timetable, San Francisco time
20:00AC 4531 from Sacramento at the gate
17:25BA 284 to London leaves the gatealso IB 3625, AS 5278, AY 5524, AA 6995, EI 8984
21 h 25 apart on the timetable, overnight
BA 284 leaves 21 h 25 after AC 4531 arrives on the timetable: more than half a day, so not a connection we count.