UA 647 then AA 640 at Denver
Durango → Denver → Charlotte
Timetable, Denver time
08:24UA 647 from Durango at the gate
14:17AA 640 to Charlotte leaves the gate
5 h 53 apart on the timetable
The last days
UA 647 and AA 640 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.