DL 4011 then DL 2663 at Denver
Atlanta → Denver → Salt Lake City
Timetable, Denver time
11:30DL 4011 from Atlanta at the gate
18:10DL 2663 to Salt Lake City leaves the gate
6 h 40 apart on the timetable
The last days
DL 4011 and DL 2663 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.