AV 6975 then AC 4432 at San Francisco
Vancouver → San Francisco → Tucson
Timetable, San Francisco time
23:01AV 6975 from Vancouver at the gate
18:47AC 4432 to Tucson leaves the gatealso UA 5688, LH 9398, NZ 9747
19 h 46 apart on the timetable, overnight
AC 4432 leaves 19 h 46 after AV 6975 arrives on the timetable: more than half a day, so not a connection we count.