AA 9908 then UA 350 at O'Hare
Milwaukee → Chicago → Philadelphia
Timetable, Chicago time
13:50AA 9908 from Milwaukee at the gate
11:03UA 350 to Philadelphia leaves the gate
21 h 13 apart on the timetable, overnight
UA 350 leaves 21 h 13 after AA 9908 arrives on the timetable: more than half a day, so not a connection we count.