AA 9866 then UA 6045 at O'Hare
Marquette → Chicago → Grand Rapids
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
09:15UA 6045 to Grand Rapids leaves the gate
22 h 45 apart on the timetable, overnight
UA 6045 leaves 22 h 45 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.