AA 516 then AS 288 at Boston
Washington National → Boston → Seattle
Timetable, Boston time
09:38AA 516 from Washington National at the gate
16:58AS 288 to Seattle leaves the gate
7 h 20 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 516 and AS 288 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.