UA 4775 then AA 1662 at Denver
Casper → Denver → Charlotte
Timetable, Denver time
10:00UA 4775 from Casper at the gate
14:19AA 1662 to Charlotte leaves the gate
4 h 19 apart on the timetable
The last days
UA 4775 and AA 1662 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.