AA 4504 then UA 1883 at O'Hare
South Bend → Chicago → Richmond
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
18:23UA 1883 to Richmond leaves the gate
23 h 48 apart on the timetable, overnight
UA 1883 leaves 23 h 48 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.