AA 9866 then AA 3600 at O'Hare
Marquette → Chicago → Montréal
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
08:17AA 3600 to Montréal leaves the gate
21 h 47 apart on the timetable, overnight
AA 3600 leaves 21 h 47 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.