Buoyancy compensator (aviation)

Buoyancy compensator (aviation) is like a special kind of life vest that planes use to help them stay in the air. The vest is made of a material called buoyancy foam, which is a type of foam that is very light and floats easily. When a plane is about to take off, the pilot wears the vest and fastens it to the plane. This vest helps the plane stay up in the air by countering the weight of the plane, so the plane can balance in the air.