AA 9866 then AA 2689 at O'Hare
Marquette → Chicago → Miami
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
10:01AA 2689 to Miami leaves the gate
23 h 31 apart on the timetable, overnight
AA 2689 leaves 23 h 31 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.