AA 4504 then UA 3497 at O'Hare
South Bend → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
12:52UA 3497 to Cincinnati Northern Kentucky leaves the gate
18 h 17 apart on the timetable, overnight
UA 3497 leaves 18 h 17 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.