AA 6486 then UA 3523 at O'Hare
Detroit → Chicago → Richmond
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
13:55UA 3523 to Richmond leaves the gate
20 h 26 apart on the timetable, overnight
UA 3523 leaves 20 h 26 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.