AA 1985 then AA 4126 at Miami
Philadelphia → Miami → Jacksonville
Timetable, Miami time
12:45AA 1985 from Philadelphia at the gate
18:55AA 4126 to Jacksonville leaves the gate
6 h 10 apart on the timetable
The last days
AA 1985 and AA 4126 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.