AA 2776 then AA 4342 at Boston
Charlotte → Boston → Washington National
Timetable, Boston time
11:22AA 2776 from Charlotte at the gate
14:25AA 4342 to Washington National leaves the gate
3 h 03 apart on the timetable
Boston’s board gives an arrival time for only about 58% of its flights, so many days show no gate time.
The last days
AA 2776 and AA 4342 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.