AA 384 then AA 1603 at Philadelphia
Jacksonville → Philadelphia → Boston
Timetable, Philadelphia time
09:19AA 384 from Jacksonville at the gate
13:10AA 1603 to Boston leaves the gate
3 h 51 apart on the timetable
The last days
AA 384 and AA 1603 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.