UA 2221 then DL 9933 at Denver
Tulsa → Denver → Atlanta
Timetable, Denver time
10:06UA 2221 from Tulsa at the gate
10:45DL 9933 to Atlanta leaves the gate
39 min apart on the timetable
The last days
UA 2221 and DL 9933 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.