WN 4999 then AA 4582 at Boston
Nashville → Boston → Washington National
Timetable, Boston time
13:50WN 4999 from Nashville at the gate
14:30AA 4582 to Washington National leaves the gate
40 min apart on the timetable
The last days
WN 4999 and AA 4582 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.