AV 2183 then UA 1372 at San Francisco
Vancouver → San Francisco → Boston
Timetable, San Francisco time
15:27AV 2183 from Vancouver at the gate
12:45UA 1372 to Boston leaves the gatealso VA 8305, NZ 9010
21 h 18 apart on the timetable, overnight
UA 1372 leaves 21 h 18 after AV 2183 arrives on the timetable: more than half a day, so not a connection we count.