AA 561 then AA 557 at Philadelphia
Jacksonville → Philadelphia → Atlanta
Timetable, Philadelphia time
11:59AA 561 from Jacksonville at the gate
15:45AA 557 to Atlanta leaves the gate
3 h 46 apart on the timetable
The last days
AA 561 and AA 557 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.