AA 9828 then UA 4772 at O'Hare
South Bend → Chicago → Columbia Regional
Timetable, Chicago time
17:25AA 9828 from South Bend at the gate
12:45UA 4772 to Columbia Regional leaves the gate
19 h 20 apart on the timetable, overnight
UA 4772 leaves 19 h 20 after AA 9828 arrives on the timetable: more than half a day, so not a connection we count.