AA 4504 then UA 4472 at O'Hare
South Bend → Chicago → Columbia Regional
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
09:05UA 4472 to Columbia Regional leaves the gate
14 h 30 apart on the timetable, overnight
UA 4472 leaves 14 h 30 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.