AV 6985 then DL 977 at San Francisco
Vancouver → San Francisco → Boston
Timetable, San Francisco time
16:06AV 6985 from Vancouver at the gate
12:30DL 977 to Boston leaves the gatealso KE 6731
20 h 24 apart on the timetable, overnight
DL 977 leaves 20 h 24 after AV 6985 arrives on the timetable: more than half a day, so not a connection we count.