Description / Abstract: Presents a comprehensive statement of user requirements for the next quarter century (to the year 2015). It examines the potential capabilities of developmental and proposed communications, navigation, and surveillance (CNS) systems and Air Traffic Management as they could apply in terminal areas and at airports. The report examines current US plans for the terminal area airspace and airports in light of the limitation of the existing air traffic management system, and addresses emerging technologies that could help meet future needs. A number of conclusions and recommendations are offered for meeting user requirements and assuring a smooth transition.