AA 3004 then AA 3309 at Charlotte
Miami → Charlotte → Milwaukee
Timetable, Charlotte time
08:25AA 3004 from Miami at the gate
08:55AA 3309 to Milwaukee leaves the gate
30 min apart on the timetable
The last days
AA 3004 and AA 3309 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.