AA 478 then AA 2648 at Miami
New York LaGuardia → Miami → Washington National
Timetable, Miami time
11:41AA 478 from New York LaGuardia at the gate
18:17AA 2648 to Washington National leaves the gate
6 h 36 apart on the timetable
The last days
AA 478 and AA 2648 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.