AA 9866 then AA 3115 at O'Hare
Marquette → Chicago → San Francisco
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
08:25AA 3115 to San Francisco leaves the gate
21 h 55 apart on the timetable, overnight
AA 3115 leaves 21 h 55 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.