AA 3004 then AA 3294 at Charlotte
Miami → Charlotte → Boston
Timetable, Charlotte time
08:25AA 3004 from Miami at the gate
16:55AA 3294 to Boston leaves the gate
8 h 30 apart on the timetable
The last days
AA 3004 and AA 3294 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.