AA 9908 then UA 2164 at O'Hare
Milwaukee → Chicago → Phoenix
Timetable, Chicago time
13:50AA 9908 from Milwaukee at the gate
11:08UA 2164 to Phoenix leaves the gate
21 h 18 apart on the timetable, overnight
UA 2164 leaves 21 h 18 after AA 9908 arrives on the timetable: more than half a day, so not a connection we count.