AA 6486 then AA 6255 at O'Hare
Detroit → Chicago → Sioux Falls
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
12:59AA 6255 to Sioux Falls leaves the gate
19 h 30 apart on the timetable, overnight
AA 6255 leaves 19 h 30 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.