The Boeing Company is a multinational defense and aerospace corporation. They consist of several business units - Boeing Defense, Space & Security, Boeing Commercial Airplanes, Boeing Shared Services Group, Boeing Capital and Engineering, Operations & Technology. They are the leading aircraft manufacturer of the world and even occupy second largest position as a defense and aerospace contractor. They even carry the tag of largest exporter in the United States, calculated in terms of value. The company has its origin in 1910, when William E. Boeing purchased Heath's shipyard and later on turned it into an airplane factory. The company came into being after a maiden flight of "B&W" seaplane manufactured in assistance from George Conard Westervelt.