Ключевые слова: aged, air, airport, america, american, antique, approval, architect, architecture, building, canceled, collection, columbia, cutting, dc, district, dulles, eero, global, mail, north, north american, passenger, philately, picture, plane, post, postage, postal, postmark, retro, saarinen, stamps, states, unique, united, us, usa, used, vintage, washington,