Because it's strong and very light.
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The alloy of aluminum commonly used in aircraft bodies is typically 7000 series aluminum, such as 7075. This alloy is known for its high strength-to-weight ratio and good fatigue resistance, making it ideal for aerospace applications.
The main alloy used to make the aircraft body is aluminum alloy. This material is favored for its lightweight properties, high strength, and corrosion resistance, which are essential qualities for constructing aircraft. Other materials such as titanium and composite materials are also used in certain parts of the aircraft body.
aluminium
depends on the type of engine, not the body
Aluminium is a popular lightweight metal used in the manufacture of aircraft.
Its light weight and resistnace to coorsion are important factors. The use worldwide differs. Aluminium alloy, coated aluminium wire are used. In the UK aluminium is not recommended for domestic use.