Air Traffic Management (ATM) in the United States is handled by the FAA using the National Airspace System (NAS), which is part of the U.S. government critical infrastructure. It is comprised of systems that are ground-based, airborne-based, and space-based. It is an interwoven group of systems that effectively work together to provide the navigation, communications, and surveillance necessary to safely and efficiently transit our airspace. For more than 50 years, the FAA has been upgrading and modernizing the components and capabilities of the NAS, with activities ranging from simple updates to large-scale replacement. The United States, as have other parts of the world, has embarked on an ambitious modernization of the Air traffic Management System called NextGen (Next Generation Air Transportation System). We are introducing new technologies, policies, procedures, and systems to increase the capacity, effectiveness, and safety of the NAS in response to changing demands in air transportation. Development of NextGen, however, represents a marked increase in scope and complexity from these activities and, therefore, in the risk associated with the NextGen undertaking. Significant changes in the technologies employed, as well as consequent changes to air traffic procedures add to the potential for a many-fold increase in both the number of risks to be encountered and the cost of encountering each risk, as well as an increasing possibility of actually missing the existence of some risks. These technology and procedure changes also add to the potential for new opportunities. This paper discusses a framework that has been developed as part of a broader Integration Environment to address the integration challenges that must be addressed to establish a viable Systems of Systems (SoS) that satisfies the needs of a diverse aviation community involved in collaborating to develop, sponsor, operate, or use NextGen.