AA 6486 then UA 5378 at O'Hare
Detroit → Chicago → Green Bay
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
11:29UA 5378 to Green Bay leaves the gate
18 h apart on the timetable, overnight
UA 5378 leaves 18 h after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.