AA 1045 then DL 2153 at Atlanta
Miami → Atlanta → Philadelphia
Timetable, Atlanta time
00:45AA 1045 from Miami at the gate
07:30DL 2153 to Philadelphia leaves the gate
6 h 45 apart on the timetable
The last days
AA 1045 and DL 2153 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.