AA 4504 then UA 5586 at O'Hare
South Bend → Chicago → Green Bay
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
17:50UA 5586 to Green Bay leaves the gate
23 h 15 apart on the timetable, overnight
UA 5586 leaves 23 h 15 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.