AA 4504 then UA 5378 at O'Hare
South Bend → Chicago → Green Bay
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
11:29UA 5378 to Green Bay leaves the gate
16 h 54 apart on the timetable, overnight
UA 5378 leaves 16 h 54 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.