AA 4523 then UA 6016 at O'Hare
Baltimore → Chicago → Green Bay
Timetable, Chicago time
20:00AA 4523 from Baltimore at the gate
19:52UA 6016 to Green Bay leaves the gate
23 h 52 apart on the timetable, overnight
UA 6016 leaves 23 h 52 after AA 4523 arrives on the timetable: more than half a day, so not a connection we count.