AA 2644 then UA 6016 at O'Hare
Pittsburgh → Chicago → Green Bay
Timetable, Chicago time
09:05AA 2644 from Pittsburgh at the gate
21:25UA 6016 to Green Bay leaves the gate
12 h 20 apart on the timetable
UA 6016 leaves 12 h 20 after AA 2644 arrives on the timetable: more than half a day, so not a connection we count.