AA 4504 then UA 5461 at O'Hare
South Bend → Chicago → Moline
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
16:30UA 5461 to Moline leaves the gate
21 h 55 apart on the timetable, overnight
UA 5461 leaves 21 h 55 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.