AA 1424 then WN 1638 at Detroit
Phoenix → Detroit → Denver
Timetable, Detroit time
15:32AA 1424 from Phoenix at the gate
16:15WN 1638 to Denver leaves the gate
43 min apart on the timetable
The last days
AA 1424 and WN 1638 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.