UA 2449 then AA 9785 at O'Hare
Phoenix → Chicago → Philadelphia
Timetable, Chicago time
12:39UA 2449 from Phoenix at the gate
21:00AA 9785 to Philadelphia leaves the gate
8 h 21 apart on the timetable
The last days
UA 2449 and AA 9785 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.