UA 3501 then AA 3237 at O'Hare
Detroit → Chicago → Richmond
Timetable, Chicago time
06:57UA 3501 from Detroit at the gate
19:07AA 3237 to Richmond leaves the gate
12 h 10 apart on the timetable
AA 3237 leaves 12 h 10 after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.