DL 2923 then DL 2434 at Atlanta
Jacksonville → Atlanta → Philadelphia
Timetable, Atlanta time
14:05DL 2923 from Jacksonville at the gate
14:45DL 2434 to Philadelphia leaves the gate
40 min apart on the timetable
The last days
DL 2923 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.