AA 3243 then AA 4723 at Boston
Washington National → Boston → New York LaGuardia
Timetable, Boston time
16:40AA 3243 from Washington National at the gate
19:35AA 4723 to New York LaGuardia leaves the gate
2 h 55 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 3243 and AA 4723 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.