AA 1065 then AA 1548 at Charlotte
Nashville → Charlotte → Washington National
Timetable, Charlotte time
07:53AA 1065 from Nashville at the gate
14:29AA 1548 to Washington National leaves the gate
6 h 36 apart on the timetable
The last days
AA 1065 and AA 1548 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.