BA 309 then BA 287 at Heathrow
Paris Charles de Gaulle → London → San Francisco
Timetable, London time
16:00BA 309 from Paris Charles de Gaulle at the gate
15:20BA 287 to San Francisco leaves the gate
23 h 20 apart on the timetable, overnight
BA 287 leaves 23 h 20 after BA 309 arrives on the timetable: more than half a day, so not a connection we count.