Ключевые слова: adventure, aeronautics, air, amusement, cloud, cloudiness, cloudy, current, entertainment, extremal, extreme, flight, fly, gliding, hobby, hover, overcast, parachute, parafoil, paraglider, paragliding, paraplane, pilot, pleasure, recreation, rest, risk, silhouette, sky, sling, soaring, sport, sportsman, strap, strop, sun, thermal, thermal column, wind, wing,