Skywriting is typically done using single-engine airplanes, such as small propeller planes. These planes are equipped with special smoke systems that release a non-toxic, environmentally friendly substance to create the written messages in the sky.
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.
Gas comes out of airplanes, which causes air pollution, and sometimes changes the sky color.
The sky
A formation
In the US the average number of airplanes in the sky on an average morning is about 4000
Sky magazine is published by delta airlines as a service to their customers. I have found no connection between sky online and sky magazine.
Condensation trails or 'con trails'.
The engines create smoke .
Some people have drawn things in the sky with airplanes, some gas or smoke but its only temporary.
-- stars -- meteors -- airplanes.
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