AA 4528 then UA 5201 at O'Hare
Norfolk → Chicago → Milwaukee
Timetable, Chicago time
07:29AA 4528 from Norfolk at the gate
20:00UA 5201 to Milwaukee leaves the gate
12 h 31 apart on the timetable
UA 5201 leaves 12 h 31 after AA 4528 arrives on the timetable: more than half a day, so not a connection we count.