The health of our nation's air transportation system is critical to our citizens and economy. However, the current approach to managing air transportation is becoming increasingly inefficient and operationally obsolete. In 2003, Congress created the Joint Planning and Development Office (JPDO) to coordinate the federal and nonfederal stakeholders necessary to plan and implement a transition from the current air transportation system to the "next generation air transportation system" (NGATS). JPDO, although housed within the Federal Aviation Administration (FAA), has seven partner agencies: the Departments of Transportation, Commerce, Defense, and Homeland Security; FAA; the National Aeronautics and Space Administration (NASA); and the White House Office of Science and Technology Policy. This testimony provides preliminary results from GAO's ongoing study of the status of JPDO's efforts. GAO provides information on (1) the extent to which JPDO is facilitating the federal interagency collaboration and aligning the human and financial resources needed to plan and implement the NGATS, (2) the actions taken by