Ключевые слова: abstract, air, air force, airplane, airspace, atmosphere, aviation, background, biological, blue, chem, chemical, chemtrail, chemtrails, climate, clouds, cloudscape, concept, condensation, conspiracy, contrail, contrails, crisscross, daylight, environment, force, government, hick blue sky, jet, jet streams, line, lines, manipulation, nature, plane, pollution, population, scientific, sky, smoke, technology, texture, trace, track, trail, trails, transport, travel, vapor, weather,