AA 9866 then AA 3449 at O'Hare
Marquette → Chicago → Fargo
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
10:00AA 3449 to Fargo leaves the gate
23 h 30 apart on the timetable, overnight
AA 3449 leaves 23 h 30 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.