AA 2366 then AA 2776 at Charlotte
Denver → Charlotte → Boston
Timetable, Charlotte time
05:07AA 2366 from Denver at the gate
08:55AA 2776 to Boston leaves the gate
3 h 48 apart on the timetable
The last days
AA 2366 and AA 2776 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.