AA 3977 then AA 3566 at O'Hare
Detroit → Chicago → Cleveland
Timetable, Chicago time
14:05AA 3977 from Detroit at the gate
21:20AA 3566 to Cleveland leaves the gate
7 h 15 apart on the timetable
The last days
AA 3977 and AA 3566 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.