AA 6486 then AA 1968 at O'Hare
Detroit → Chicago → Tucson
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
11:40AA 1968 to Tucson leaves the gate
18 h 11 apart on the timetable, overnight
AA 1968 leaves 18 h 11 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.