The structure of aircraft has changed enormously over the last century, with most changes being made to aeronautical engineering. Almost every aspect of creating and designing an aircraft has changed. Changes have been made to aerodynamics, engineering, navigation aids, interior fittings and structural design. The first successful flight conducted by the Wright brothers was powered by a small light engine that wouldn’t weigh down the structure of the aircraft itself. The first jet engine, a heavier type of engine, was created and used during WWII. Since then, the structure of the aircraft has completely changed and is still changing today.