AA 581 then AA 2151 at O'Hare
Miami → Chicago → Nashville
Timetable, Chicago time
09:30AA 581 from Miami at the gate
20:50AA 2151 to Nashville leaves the gate
11 h 20 apart on the timetable
The last days
AA 581 and AA 2151 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.