AA 2489 then UA 6016 at O'Hare
Baltimore → Chicago → Green Bay
Timetable, Chicago time
08:45AA 2489 from Baltimore at the gate
21:25UA 6016 to Green Bay leaves the gate
12 h 40 apart on the timetable
UA 6016 leaves 12 h 40 after AA 2489 arrives on the timetable: more than half a day, so not a connection we count.