AA 6486 then AA 4189 at O'Hare
Detroit → Chicago → Missoula
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
09:40AA 4189 to Missoula leaves the gate
16 h 11 apart on the timetable, overnight
AA 4189 leaves 16 h 11 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.