Ключевые слова: agriculture, aircraft, airplane, architecture, aviation, blades, business, circle, city, control, copter, dwellings, engine, environment, flight, fly, flying, forestry, forests, helicopter, highrise buildings, landing, military, motion, pests and diseases, plants, power, propeller, rise, rotation, rotor, scenery, search, security, sky, speed, spraying, technology, tour, tourism, transport, transportation, travel, trees, turbine, vertical,