AIA is the body that authors the NAS standards.
The following is from their website, http://www.aia-aerospace.org/
The Aerospace Industries Association, founded in 1919 only a few years after the birth of flight, is the premier trade association representing the nation's major aerospace and defense manufacturers.
Based in Arlington, Va., AIA is led by a Board of Governors that meets twice a year and consists of senior representatives (generally chief executive officers) of member companies, and an Executive Committee that meets more frequently. A hallmark of AIA is that it receives its policy guidance from the direct involvement of CEO-level officers of the country's major aerospace companies. The government frequently seeks advice from AIA on issues, and AIA provides a forum for government and industry representatives to exchange views and resolve problems on non-competitive matters related to the aerospace industry.
Today, more than 300 major aerospace and defense companies and their suppliers are members of the association, embodying every high-technology manufacturing segment of the U.S. aerospace and defense industry from commercial aviation and avionics, to manned and unmanned defense systems, to space technologies and satellite communications.