AA 3306 then AA 1173 at Miami
Philadelphia → Miami → Nashville
Timetable, Miami time
13:35AA 3306 from Philadelphia at the gate
20:34AA 1173 to Nashville leaves the gate
6 h 59 apart on the timetable
The last days
AA 3306 and AA 1173 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.