UA 3501 then AA 4462 at O'Hare
Detroit → Chicago → Madison
Timetable, Chicago time
06:57UA 3501 from Detroit at the gate
23:00AA 4462 to Madison leaves the gate
16 h 03 apart on the timetable
AA 4462 leaves 16 h 03 after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.