UA 3501 then AA 2571 at O'Hare
Detroit → Chicago → Richmond
Timetable, Chicago time
06:57UA 3501 from Detroit at the gate
18:59AA 2571 to Richmond leaves the gate
12 h 02 apart on the timetable
AA 2571 leaves 12 h 02 after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.