DL 2838 then DL 2434 at Atlanta
Cleveland → Atlanta → Philadelphia
Timetable, Atlanta time
09:00DL 2838 from Cleveland at the gate
14:45DL 2434 to Philadelphia leaves the gate
5 h 45 apart on the timetable
The last days
DL 2838 and DL 2434 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.