AA 4504 then UA 3565 at O'Hare
South Bend → Chicago → Columbus (Ohio)
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
12:40UA 3565 to Columbus (Ohio) leaves the gate
18 h 05 apart on the timetable, overnight
UA 3565 leaves 18 h 05 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.