DL 1903 then DL 2128 at Atlanta
Tampa → Atlanta → Denver
Timetable, Atlanta time
06:45DL 1903 from Tampa at the gate
10:40DL 2128 to Denver leaves the gate
3 h 55 apart on the timetable
The last days
DL 1903 and DL 2128 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.