monoplanes
ANSWER 2
any plane that is certified for aerobatics can do skywriting - a plane not certified for aerobatics cannot legally perform the maneuvers necessary to skywrite although that doesnt stop some pilots - although some experimental classification aircraft can do aerobatics they are limited where they can fly and perform so usually arent used for skywriting - some small low power aircraft are used such as the piper super cub and Cessna 150/152, older biplanes are commonly used like the Boeing stearman and dehavilland tiger moth, modern high performance aerobats like the pitts and extra 300, and even converted cessna 172's have been used
The Air Force does not typically send airplanes specifically to write in the sky. The writing or drawing in the sky that you may see is usually done by civilian pilots or aerial advertising companies using specialized equipment. The Air Force's primary mission is national security and defense.
The sky
In the sky, you can see clouds, the sun, the moon, stars, and sometimes airplanes.
A formation
Sky magazine is published by delta airlines as a service to their customers. I have found no connection between sky online and sky magazine.
The engines create smoke .
Condensation trails or 'con trails'.
Some people have drawn things in the sky with airplanes, some gas or smoke but its only temporary.
-- stars -- meteors -- airplanes.
The sky appears blue due to Rayleigh scattering, where shorter blue wavelengths of light are scattered more than other colors by molecules in the Earth's atmosphere. This scattering effect is present regardless of whether airplanes are flying or not. Airplane contrails can contribute to haze under certain atmospheric conditions, but they are not the primary reason for the sky's blue color.
The main example of this is a kite. Kites are generally toys which can fly in the sky with the help of a long string. Certain types of model airplanes can fly from a string, and weather balloons might be tethered to heavy ropes.
airplanes