AA 4669 then AA 320 at O'Hare
Madison → Chicago → Philadelphia
Timetable, Chicago time
08:00AA 4669 from Madison at the gate
08:30AA 320 to Philadelphia leaves the gate
30 min apart on the timetable
The last days
AA 4669 and AA 320 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.