AA 9866 then AA 315 at O'Hare
Marquette → Chicago → Washington National
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
09:30AA 315 to Washington National leaves the gate
23 h apart on the timetable, overnight
AA 315 leaves 23 h after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.