AC 4121 then AC 4579 at San Francisco
Ontario → San Francisco → Tucson
Timetable, San Francisco time
10:55AC 4121 from Ontario at the gate
08:22AC 4579 to Tucson leaves the gatealso UA 5433, NZ 9749
21 h 27 apart on the timetable, overnight
AC 4579 leaves 21 h 27 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.