UA 337 then AA 1313 at Denver
Phoenix Sky Harbor → Denver → Philadelphia
Timetable, Denver time
08:10UA 337 from Phoenix Sky Harbor at the gate
12:08AA 1313 to Philadelphia leaves the gate
3 h 58 apart on the timetable
The last days
UA 337 and AA 1313 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.