UA 2045 then DL 2787 at Denver
Miami → Denver → Detroit
Timetable, Denver time
10:04UA 2045 from Miami at the gate
10:36DL 2787 to Detroit leaves the gate
32 min apart on the timetable
The last days
UA 2045 and DL 2787 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.