The Aerospace Industries Association (AIA) is the premier trade association representing major aerospace and defense manufacturers and suppliers in the United States. AIA's National Aerospace Standards (NAS) are voluntary standards developed by the aerospace industry. The NAS parts are most well-known for state-of-the-art, high strength, precision fasteners, electrical connectors, splices and terminations, rod end bearings, and many other types of hardware and components, and are available in a 3D model library.