AA 69 then AA 3991 at Miami
Madrid → Miami → Nashville
Timetable, Miami time
13:40AA 69 from Madrid at the gate
14:25AA 3991 to Nashville leaves the gate
45 min apart on the timetable
The last days
AA 69 and AA 3991 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.