AA 6501 then UA 6016 at O'Hare
Nashville → Chicago → Green Bay
Timetable, Chicago time
08:35AA 6501 from Nashville at the gate
21:25UA 6016 to Green Bay leaves the gate
12 h 50 apart on the timetable
UA 6016 leaves 12 h 50 after AA 6501 arrives on the timetable: more than half a day, so not a connection we count.