AA 709 then AA 817 at Philadelphia
Jacksonville → Philadelphia → Miami
Timetable, Philadelphia time
13:13AA 709 from Jacksonville at the gate
16:28AA 817 to Miami leaves the gate
3 h 15 apart on the timetable
The last days
AA 709 and AA 817 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.