AA 4649 then AA 2537 at O'Hare
Pittsburgh → Chicago → Tucson
Timetable, Chicago time
10:55AA 4649 from Pittsburgh at the gate
11:45AA 2537 to Tucson leaves the gate
50 min apart on the timetable
The last days
AA 4649 and AA 2537 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.