AA 803 then AA 2388 at Miami
Las Vegas → Miami → Boston
Timetable, Miami time
13:44AA 803 from Las Vegas at the gate
19:33AA 2388 to Boston leaves the gate
5 h 49 apart on the timetable
The last days
AA 803 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.