AA 4504 then UA 5231 at O'Hare
South Bend → Chicago → Moline
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
08:45UA 5231 to Moline leaves the gate
14 h 10 apart on the timetable, overnight
UA 5231 leaves 14 h 10 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.