DL 1903 then DL 1579 at Atlanta
Tampa → Atlanta → Miami
Timetable, Atlanta time
06:45DL 1903 from Tampa at the gate
12:50DL 1579 to Miami leaves the gate
6 h 05 apart on the timetable
The last days
DL 1903 and DL 1579 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.