Most airplanes today are made out of aluminum, a strong, yet lightweight metal. The first passenger plane, the Ford Tri-Motor from 1928, was made out of the material. It was considered to be lightweight, inexpensive, and state-of-the-art. In fact, as much as 70% of an aircraft was once made of aluminum. The modern Boeing 747 is an aluminum airplane as well.
Other metals, like steel and titanium, are sometimes used to build aircraft. However, steeel is heavy, therefore, not too much of it is used. Titanium is almost as strong as steel, has a medium weight, is heat resistant, and is corrosion resistant. The Lockheed SR-71 Blackbird, the world’s fastest jet-propelled aircraft, is made of titanium.
Composite materials such as graphite-epoxy are strong, but can weigh half as much as aluminum. These lightweight, customizable materials are becoming more popular. More than half of the materials used to make the Boeing 787 Dreamliner are composites.