eye clip art How does Skywriting work? A paraffin oil is injected to the exhaust in the airplane at controlled times, causing a white smoke in order to create. As the plane flies in numerous formations activating the oil spray, letters of your message are formed. The letters are formed from 7000 to 17,000 feet up, and so are occasionally miles tall. When purchasing the rights or substitute for an item of source material, whether book and other format, you're going to have to arrange many different payments. Often you set a purchase price, a yearly option price, and occasionally more for absolute rights. One thing which is often offered is the "back end."