AA 9866 then UA 4472 at O'Hare
Marquette → Chicago → Columbia Regional
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
09:05UA 4472 to Columbia Regional leaves the gate
22 h 35 apart on the timetable, overnight
UA 4472 leaves 22 h 35 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.