AC 4121 then UA 1769 at San Francisco
Ontario → San Francisco → Miami
Timetable, San Francisco time
10:55AC 4121 from Ontario at the gate
23:20UA 1769 to Miami leaves the gatealso CM 2876, NZ 2925, AZ 4495, EK 6427, VA 8392
12 h 25 apart on the timetable
UA 1769 leaves 12 h 25 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.