SQ 1460 then BA 284 at San Francisco
New York JFK → San Francisco → London
Timetable, San Francisco time
21:37SQ 1460 from New York JFK at the gate
17:25BA 284 to London leaves the gatealso IB 3625, AS 5278, AY 5524, AA 6995, EI 8984
19 h 48 apart on the timetable, overnight
BA 284 leaves 19 h 48 after SQ 1460 arrives on the timetable: more than half a day, so not a connection we count.