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Skywriting
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Skywriting is the process of using a small aircraft, able to expel special smoke during flight, to fly in certain patterns to create writing readable by someone on the ground. The message can be a frivolous or generally meaningless greeting or phrase, an advertisement aimed at everyone in the vicinity, a general public display of celebration or goodwill, or a personal message such as a marriage proposal or birthday wish.
The typical smoke generator consists of a pressurized container holding a low viscosity oil such as Chevron/Texaco "Canopus 13" (formerly "Corvus Oil").

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Encyclopedia
Skywriting is the process of using a small aircraft, able to expel special smoke during flight, to fly in certain patterns to create writing readable by someone on the ground. The message can be a frivolous or generally meaningless greeting or phrase, an advertisement aimed at everyone in the vicinity, a general public display of celebration or goodwill, or a personal message such as a marriage proposal or birthday wish.
The typical smoke generator consists of a pressurized container holding a low viscosity oil such as Chevron/Texaco "Canopus 13" (formerly "Corvus Oil"). The oil is injected into the hot exhaust manifold causing it to vaporize into a huge amount of dense white smoke.
Skywriting is never a permanent process. Wind and dispersal of the smoke cause the writing to blur, usually within a few minutes. However special "skytyping" techniques have been developed to write in the sky in a dot-matrix fashion, and are legible for longer despite the inevitable blurring effect caused by wind.
Despite its transient nature, skywriting has an obvious visual impact and can be considered a form of visual pollution.
In a 1926 letter to The New York Times one Albert T. Reid wrote:
- A newspaper paragraph says skywriting was perfected in England in 1919 and used in the United States the next year. Art Smith, who succeeded Beachey in flying exhibitions at the Panama-Pacific Exposition in San Francisco in 1915, after the latter had been killed, did skywriting, always ending his breathtaking stunts by writing "Good night." This was not a trial exhibition but a part of every flight, and was always witnessed by thousands.
The first use of skywriting for advertising purposes was in 1922.
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