AV 2183 then UA 901 at San Francisco
Vancouver → San Francisco → London
Timetable, San Francisco time
15:27AV 2183 from Vancouver at the gate
12:50UA 901 to London leaves the gatealso LX 3069, AC 5448, OS 7856, SN 9105, LH 9375, NZ 9830
21 h 23 apart on the timetable, overnight
UA 901 leaves 21 h 23 after AV 2183 arrives on the timetable: more than half a day, so not a connection we count.