AA 9866 then AA 492 at O'Hare
Marquette → Chicago → Cancún
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
10:05AA 492 to Cancún leaves the gate
23 h 35 apart on the timetable, overnight
AA 492 leaves 23 h 35 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.