UA 3501 then AA 5247 at O'Hare
Detroit → Chicago → Dayton
Timetable, Chicago time
06:57UA 3501 from Detroit at the gate
19:27AA 5247 to Dayton leaves the gate
12 h 30 apart on the timetable
AA 5247 leaves 12 h 30 after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.