AS 634 then BA 284 at San Francisco
Las Vegas → San Francisco → London
Timetable, San Francisco time
17:41AS 634 from Las Vegas at the gatealso QF 3697, FJ 5841, AA 7412, CX 7935, QR 8861
17:25BA 284 to London leaves the gatealso IB 3625, AS 5278, AY 5524, AA 6995, EI 8984
23 h 44 apart on the timetable, overnight
BA 284 leaves 23 h 44 after AS 634 arrives on the timetable: more than half a day, so not a connection we count.