F9 3059 then WN 1572 at Atlanta
Miami → Atlanta → Denver
Timetable, Atlanta time
13:56F9 3059 from Miami at the gate
18:40WN 1572 to Denver leaves the gate
4 h 44 apart on the timetable
The last days
F9 3059 and WN 1572 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.