AA 3140 then AA 2388 at Miami
Jacksonville → Miami → Boston
Timetable, Miami time
08:35AA 3140 from Jacksonville at the gate
19:33AA 2388 to Boston leaves the gate
10 h 58 apart on the timetable
The last days
AA 3140 and AA 2388 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.