AA 3663 then WN 674 at Miami
Atlanta → Miami → Denver
Timetable, Miami time
07:24AA 3663 from Atlanta at the gatealso MQ 3663
16:20WN 674 to Denver leaves the gate
8 h 56 apart on the timetable
The last days
AA 3663 and WN 674 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.