AA 4778 then DL 2403 at Houston
Philadelphia → Houston → Atlanta
Timetable, Houston time
13:55AA 4778 from Philadelphia at the gate
18:19DL 2403 to Atlanta leaves the gate
4 h 24 apart on the timetable
The last days
AA 4778 and DL 2403 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.