AA 3236 then AA 1366 at O'Hare
Phoenix → Chicago → Denver
Timetable, Chicago time
05:00AA 3236 from Phoenix at the gate
11:54AA 1366 to Denver leaves the gate
6 h 54 apart on the timetable
The last days
AA 3236 and AA 1366 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.