AA 4504 then UA 2370 at O'Hare
South Bend → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
14:32UA 2370 to Cincinnati Northern Kentucky leaves the gate
19 h 57 apart on the timetable, overnight
UA 2370 leaves 19 h 57 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.