AA 2247 then AA 2743 at Miami
Boston → Miami → Washington National
Timetable, Miami time
17:50AA 2247 from Boston at the gate
18:20AA 2743 to Washington National leaves the gate
30 min apart on the timetable
The last days
AA 2247 and AA 2743 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.