AA 2064 then AA 4582 at Boston
Miami (MIA) → Boston → Washington National
Timetable, Boston time
10:18AA 2064 from Miami (MIA) at the gate
14:30AA 4582 to Washington National leaves the gate
4 h 12 apart on the timetable
Boston’s board gives an arrival time for only about 58% of its flights, so many days show no gate time.
The last days
AA 2064 and AA 4582 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.