AA 4476 then AA 5363 at Philadelphia
Louisville → Philadelphia → Washington National
Timetable, Philadelphia time
09:30AA 4476 from Louisville at the gate
15:51AA 5363 to Washington National leaves the gate
6 h 21 apart on the timetable
The last days
AA 4476 and AA 5363 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.