AA 9866 then AA 4212 at O'Hare
Marquette → Chicago → Providence
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
08:18AA 4212 to Providence leaves the gate
21 h 48 apart on the timetable, overnight
AA 4212 leaves 21 h 48 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.