AA 3303 then AA 678 at Houston
Philadelphia → Houston → Miami
Timetable, Houston time
11:54AA 3303 from Philadelphia at the gate
17:34AA 678 to Miami leaves the gate
5 h 40 apart on the timetable
The last days
AA 3303 and AA 678 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.