AV 2183 then LY 4668 at San Francisco
Vancouver → San Francisco → Boston
Timetable, San Francisco time
15:27AV 2183 from Vancouver at the gate
12:30LY 4668 to Boston leaves the gate
21 h 03 apart on the timetable, overnight
LY 4668 leaves 21 h 03 after AV 2183 arrives on the timetable: more than half a day, so not a connection we count.