CZ 1646 then VS 20 at San Francisco
Charlotte → San Francisco → London
Timetable, San Francisco time
16:51CZ 1646 from Charlotte at the gatealso AA 2569
16:40VS 20 to London leaves the gatealso NZ 4162, KL 4813, SV 4830, DL 5964, AF 9650
23 h 49 apart on the timetable, overnight
VS 20 leaves 23 h 49 after CZ 1646 arrives on the timetable: more than half a day, so not a connection we count.