AA 6486 then AA 1366 at O'Hare
Detroit → Chicago → Denver
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
11:54AA 1366 to Denver leaves the gate
18 h 25 apart on the timetable, overnight
AA 1366 leaves 18 h 25 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.