AA 591 then UA 5991 at Denver
Charlotte → Denver → Salt Lake City
Timetable, Denver time
15:12AA 591 from Charlotte at the gate
15:45UA 5991 to Salt Lake City leaves the gate
33 min apart on the timetable
The last days
AA 591 and UA 5991 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.