National Airspace System: FAA Has Implemented Some Free Flight Initiatives, but Challenges Remain

Pursuant to a congressional request, GAO reviewed the: (1) status of the Federal Aviation Administration's (FAA) efforts to implement free flight, including a planned operational demonstration formerly known as Flight 2000 and now called the Free Flight Operational Enhancement Program; and (2) views of the aviation community and FAA on the challenges that must be met to implement free flight in a cost-effective manner.