AA 5551 then WN 3368 at Philadelphia
Northwest Arkansas → Philadelphia → Denver
Timetable, Philadelphia time
09:50AA 5551 from Northwest Arkansas at the gate
12:10WN 3368 to Denver leaves the gate
2 h 20 apart on the timetable
The last days
AA 5551 and WN 3368 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.