AA 5235 then WN 1638 at Detroit
Philadelphia → Detroit → Denver
Timetable, Detroit time
14:47AA 5235 from Philadelphia at the gate
16:15WN 1638 to Denver leaves the gate
1 h 28 apart on the timetable
The last days
AA 5235 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.