AA 756 then AA 2582 at Miami
Norfolk → Miami → Boston
Timetable, Miami time
08:24AA 756 from Norfolk at the gate
12:21AA 2582 to Boston leaves the gate
3 h 57 apart on the timetable
The last days
AA 756 and AA 2582 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.