The proposed Networked Communications and Speech System (NCSS) has been conceived for implementation in simulation facilities within NASA for human-in-the-loop (HITL) assessment of airspace system concepts and technologies. A list of such facilities at Ames Research Center and Langley Research Center has been identified jointly by the FAA and NASA in a recently released NextGen Human Factors Research Coordinate Plan. The software-based system is expected to reduce acquisition and life-cycle costs associated with the communications equipment, and to provide additional flexibility and cost savings in performing HITL experiments. The Networked Communications and Speech System (NCSS) can be adapted for other human factors simulation facilities within the FAA, as identified in the joint FAA/NASA NextGen Human Factors Research Coordinate Plan. Similar facilities in major aerospace vendors of air traffic management systems can also benefit from this technology. In addition, the NCSS will also benefit air traffic control training facilities, including the FAA Academy located at the Mike Monroney Aeronautical Center in Oklahoma City, OK, and DoD training facilities such as the Naval Air Technical Training Center (NATTC) in Pensacola, FL.