AA 4708 then AA 1821 at Boston
Harrisburg → Boston → New York LaGuardia
Timetable, Boston time
08:34AA 4708 from Harrisburg at the gate
13:41AA 1821 to New York LaGuardia leaves the gate
5 h 07 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 4708 and AA 1821 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.