This is according to the chemtrail conspiracy theory. That is, the government is spraying the chemical for various purposes. Contrails, left by planes, are condensed water vapors that are left when conditions are right for them to be formed.
The prototype SCRAM jets have not been mannedWhen the technology improves to being reliable, controllable and realistically safe they will be.
usually steel and aluminum
stratosphere
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Nothing. Only water sprayed out through jets.
Birds, Bats, Jumbo Jets.
Jets fly through the stratosphere, which is the second layer of the Earth's atmosphere. The stratosphere contains the ozone layer, which helps to absorb and block harmful ultraviolet radiation from the sun.
The heat of the engines, especially jets, leaves a trail of white condensation in the cold atmosphere.
Jets.
Jumbo jets are primarily constructed from a combination of aluminum alloys, composite materials, and titanium. Aluminum provides a lightweight and durable structure, while composites, such as carbon-fiber-reinforced polymer, help reduce weight and improve fuel efficiency. Titanium is used in critical high-stress components due to its strength and resistance to corrosion. Together, these materials ensure the aircraft's performance, safety, and longevity.
Jets are made out of a variety of materials including steel, aluminum, and fiberglass. High strength, light weight carbon fiber is also seeing increased use on aircraft.
Because space ships are too high up in the atmosphere and the other option, balloons, are pretty boring.