Ключевые слова: 4, aeroplane, aerospace, air, aircraft, airliner, airplane, altitude, aviation, big, blue, business, by, chemtrail, civilian, clear, co2, commercial, contrail, control, cruise, cruising, emission, engine, exhaust, flight, fly, four, high, huge, industry, jet, jetplane, journey, level, mode, modern, pass, passenger, plane, pollution, sky, speed, traffic, trail, transport, transportation, travel, up, vehicle,