Ключевые слова: 747, activity, aerial, air, aircraft, airlines, airplane, airshow, america, annual, bay, blue, boeing, buildings, ca, california, city, coast, demonstration, event, flag, fleet, guard, helicopter, landing, navy, october, outdoor, parachute, people, popular, san francisco, seals, show, sky, skyline, technology, tourism, tradition, transportation, travel, united, usa, vacation, week, writing,