While boron itself is a metalloid and not a metal, it is a key component in some high-strength aluminum alloys used in aerospace applications. These alloys, like boron-aluminum or boron-aluminum-lithium, offer superior strength and stiffness compared to traditional aluminum alloys.

However, the most common metal used for aircraft parts is simply aluminum itself. It is lightweight, corrosion-resistant, and readily available, making it ideal for a wide range of aircraft components.