AV 2183 then DL 977 at San Francisco
Vancouver → San Francisco → Boston
Timetable, San Francisco time
15:27AV 2183 from Vancouver at the gate
12:40DL 977 to Boston leaves the gatealso VS 2372, KE 6731, LA 7046
21 h 13 apart on the timetable, overnight
DL 977 leaves 21 h 13 after AV 2183 arrives on the timetable: more than half a day, so not a connection we count.