AV 6975 then UA 796 at San Francisco
Vancouver → San Francisco → Boston
Timetable, San Francisco time
23:01AV 6975 from Vancouver at the gate
21:30UA 796 to Boston leaves the gatealso VA 8308, NZ 9012
22 h 29 apart on the timetable, overnight
UA 796 leaves 22 h 29 after AV 6975 arrives on the timetable: more than half a day, so not a connection we count.