AV 2183 then UA 2356 at San Francisco
Vancouver → San Francisco → Boston
Timetable, San Francisco time
15:27AV 2183 from Vancouver at the gate
10:40UA 2356 to Boston leaves the gatealso VA 8309, NZ 9015
19 h 13 apart on the timetable, overnight
UA 2356 leaves 19 h 13 after AV 2183 arrives on the timetable: more than half a day, so not a connection we count.