AA 9866 then AA 3394 at O'Hare
Marquette → Chicago → Columbia Regional
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
08:29AA 3394 to Columbia Regional leaves the gate
21 h 59 apart on the timetable, overnight
AA 3394 leaves 21 h 59 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.