AA 3304 then AA 4523 at O'Hare
Miami → Chicago → Indianapolis
Timetable, Chicago time
19:55AA 3304 from Miami at the gate
20:45AA 4523 to Indianapolis leaves the gate
50 min apart on the timetable
The last days
AA 3304 and AA 4523 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.