In the first days of aviation the leather helmets used in motor-racing were adopted by pilots as head protection. The initial design of early leather flying helmets was adapted during the 1930s to become the type B helmet which enabled the external attachment of radio earphones oxygen masks and removable goggles to protect pilots eyes from the elements.
An aircraft is a machine that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. Common examples of aircraft include airplanes, helicopters, airships (including blimps), gliders, and hot air balloons.