Abstract: The National Airspace System (NAS) is the large and complex network of airports, airways, and air traffic control facilities that support commercial, private, and military use of the national airspace. The NAS was created and has evolved to serve primarily manned aircraft operations. However, the ongoing development of unmanned aircraft (UA) technology has created the potential for significant economic benefits, and there is growing interest and demand for greater access of UA to the NAS. The…