World War I was the first major war in which airplanes were used as part of the military. The aircraft was created by the Wright Brothers in 1903, just 11 years before the start of World War I. When the war first started, the aircraft played a minor role in the war, but, at the end of the war, the air force has become an important branch of the armed forces.
A biplane is a fixed-wing aircraft with two main wings that stacked one above with the other. The ruling is the first aircraft to fly controlled. Wright Flyer is a biplane wing arrangement like mostly all aircraft in the early years of aviation. While a biplane wing structure has a structural advantage over the monoplane, it can produce more frictional or drag than unbraced cantilever monoplane wing. A good materials, engineering and efforts for faster speed made the biplane configuration obsolete for most purposes by the late 1930 's. Biplanes offer a few advantages over the design of the cantilever monoplane. Conventionally they allow a lighter wing structure, low wing loading and smaller for a given wing area. Somehow, disruption of the flow of the air over each wing drag can increases significantly. Biplanes generally need extensive bracing which can causes additional drag. Biplanes affairs as distinguished from the wings where the wings are put forward and back rather than above and below. The term is also sometimes used in biology to describe the wings of some flying animals.