AV 2183 then UA 1496 at San Francisco
Vancouver → San Francisco → Boston
Timetable, San Francisco time
15:27AV 2183 from Vancouver at the gate
14:42UA 1496 to Boston leaves the gatealso VA 8307, NZ 9013
23 h 15 apart on the timetable, overnight
UA 1496 leaves 23 h 15 after AV 2183 arrives on the timetable: more than half a day, so not a connection we count.