AA 9866 then NH 8421 at O'Hare
Marquette → Chicago → Tokyo Narita
Timetable, Chicago time
10:30AA 9866 from Marquette at the gate
09:15NH 8421 to Tokyo Narita leaves the gate
22 h 45 apart on the timetable, overnight
NH 8421 leaves 22 h 45 after AA 9866 arrives on the timetable: more than half a day, so not a connection we count.