AA 2903 then AA 498 at Boston
Philadelphia → Boston → New York LaGuardia
Timetable, Boston time
08:40AA 2903 from Philadelphia at the gate
17:20AA 498 to New York LaGuardia leaves the gate
8 h 40 apart on the timetable
The last days
AA 2903 and AA 498 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.