AA 9908 then UA 3376 at O'Hare
Milwaukee → Chicago → Columbus (Ohio)
Timetable, Chicago time
08:20AA 9908 from Milwaukee at the gate
20:30UA 3376 to Columbus (Ohio) leaves the gate
12 h 10 apart on the timetable
UA 3376 leaves 12 h 10 after AA 9908 arrives on the timetable: more than half a day, so not a connection we count.