AA 2903 then AA 4746 at Boston
Philadelphia → Boston → Washington National
Timetable, Boston time
08:40AA 2903 from Philadelphia at the gate
12:39AA 4746 to Washington National leaves the gate
3 h 59 apart on the timetable
The last days
AA 2903 and AA 4746 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.