AA 4040 then AA 3165 at Phoenix
Denver → Phoenix → Chicago O'Hare
Timetable, Phoenix time
07:07AA 4040 from Denver at the gate
13:12AA 3165 to Chicago O'Hare leaves the gate
6 h 05 apart on the timetable
The last days
AA 4040 and AA 3165 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.