UA 4179 then AA 535 at O'Hare
Roanoke → Chicago → Detroit
Timetable, Chicago time
07:44UA 4179 from Roanoke at the gate
21:30AA 535 to Detroit leaves the gate
13 h 46 apart on the timetable
AA 535 leaves 13 h 46 after UA 4179 arrives on the timetable: more than half a day, so not a connection we count.