AA 9908 then UA 8108 at O'Hare
Milwaukee → Chicago → San Francisco
Timetable, Chicago time
08:20AA 9908 from Milwaukee at the gate
20:25UA 8108 to San Francisco leaves the gate
12 h 05 apart on the timetable
UA 8108 leaves 12 h 05 after AA 9908 arrives on the timetable: more than half a day, so not a connection we count.