AA 3155 then AA 866 at O'Hare
Miami → Chicago → Phoenix
Timetable, Chicago time
09:32AA 3155 from Miami at the gate
10:30AA 866 to Phoenix leaves the gate
58 min apart on the timetable
The last days
AA 3155 and AA 866 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.