AA 4391 then AA 353 at Boston
Madison → Boston → Miami (MIA)
Timetable, Boston time
10:23AA 4391 from Madison at the gate
15:00AA 353 to Miami (MIA) leaves the gate
4 h 37 apart on the timetable
The last days
AA 4391 and AA 353 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.