AA 4455 then AA 1489 at Boston
Washington National → Boston → New York LaGuardia
Timetable, Boston time
08:26AA 4455 from Washington National at the gate
12:15AA 1489 to New York LaGuardia leaves the gate
3 h 49 apart on the timetable
Boston’s board gives an arrival time for only about 59% of its flights, so many days show no gate time.
The last days
AA 4455 and AA 1489 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.