AV 6975 then UA 8177 at San Francisco
Vancouver → San Francisco → San Diego
Timetable, San Francisco time
23:01AV 6975 from Vancouver at the gate
19:25UA 8177 to San Diego leaves the gate
20 h 24 apart on the timetable, overnight
UA 8177 leaves 20 h 24 after AV 6975 arrives on the timetable: more than half a day, so not a connection we count.