AA 9908 then UA 2684 at O'Hare
Milwaukee → Chicago → Atlanta
Timetable, Chicago time
13:50AA 9908 from Milwaukee at the gate
10:31UA 2684 to Atlanta leaves the gate
20 h 41 apart on the timetable, overnight
UA 2684 leaves 20 h 41 after AA 9908 arrives on the timetable: more than half a day, so not a connection we count.