AA 3171 then UA 3755 at O'Hare
Phoenix → Chicago → Denver
Timetable, Chicago time
09:31AA 3171 from Phoenix at the gate
18:37UA 3755 to Denver leaves the gate
9 h 06 apart on the timetable
Today
From the airport’s board at 09:13 Chicago time
09:31AA 3171 is cancelled
18:37UA 3755 due to leave, no estimate yet
The last days
AA 3171 and UA 3755 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.