AA 2986 then AA 2539 at Miami
Denver → Miami → Boston
Timetable, Miami time
12:00AA 2986 from Denver at the gate
20:15AA 2539 to Boston leaves the gate
8 h 15 apart on the timetable
The last days
AA 2986 and AA 2539 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.