After the invention of the aircraft, these are mainly used for the purpose of war. A large number of aircraft used during the Second World War. The atomic bomb on the cities of Japan was also through by the USA aircraft. Continue up gradation in the aviation technology made it possible to construct advance aircraft for war. These aircraft are capable in flying several times greater than the velocity of sound. In present day scenario aircraft are the best and fastest way to reach from one place to another. Continue up gradation in the civil aviation made it possible to travel with ease.