AA 9866 then AA 1250 at O'Hare
Marquette → Chicago → Miami
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
08:43AA 1250 to Miami leaves the gate
22 h 13 apart on the timetable, overnight
AA 1250 leaves 22 h 13 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.