NASA Spinoff

Comprehensive Software Eases Air Traffic Management

Gridlock, bottlenecks, bumper-to-bumper jams—we all get caught in congestion at one time or another, as the rigors of road traffic are an inevitable part of life. Sometimes we do our best to get ahead, taking advantage of the slightest opening in the next lane, in anticipation that it is moving quicker than the snail’s pace of our current position. Other times, we just patiently ride it out, opting to sit back and get comfortable, fully surrendering to the sea of cars and trucks ahead.

The Future Air Traffic Management Concepts Evaluation Tool(FACET), developed at Ames Research Center, was selected as NASA’s 2006 “Software of the Year.” FACET is a flexible software tool that provides powerful simulation capabilities and can rapidly generate thousands of aircraft trajectories to enable efficient planning of traffic flows at the national level.
And then there are the times that, in all desperation, we look up into the sky, see all of that available space, and ask ourselves when the future is going to bestow upon us the fantastic gift of flying cars that would help open things up and let us bypass all of the congestion on the ground.

Airspace, however, is not much different than road space, in terms of congestion. As much as we like to think that there is clear, blue sky as far as the eye can see, the truth of the matter is that, with thousands of planes flying overhead in the United States at any given time, there can sometimes be just as many traffic and delay problems associated with air travel as there can be with ground travel.

To keep a handle on the complex flow of aircraft, the United States depends on a tightly run air traffic control system. Air traffic control centers around the country work to help aircraft maintain safe distances while in flight, as well as during takeoffs and landings, to prevent accidents. In addition, air traffic control centers work to keep in-flight pilots informed of changing weather conditions that may impact their flight paths. Essentially, the air traffic control centers’ main objectives are to maximize safety and minimize delays in the air and at U.S. airports and airfields.

To help air traffic control centers improve the safety and the efficiency of the National Airspace System (the term used for the overall environment in which aircraft operate throughout the United States), Ames Research Center developed software called the Future Air Traffic Management Concepts Evaluation Tool (FACET). With powerful modeling and simulation capabilities, FACET can swiftly generate thousands of aircraft trajectories (as many as 15,000 on a single computer) that can help to streamline the flow of air traffic across the entire National Airspace System. Actual air traffic data and weather information are utilized to evaluate an aircraft’s flight-plan route and predict its trajectories for the climb, cruise, and descent phases. The dynamics for heading (the direction the aircraft nose is pointing) and airspeed are also modeled by the FACET software, while performance parameters such as climb/descent rates and speeds and cruise speeds can also be obtained from data tables. The resulting trajectories and traffic flow data are presented in a 3-D graphical user interface.

FACET is one of the many air traffic management software tools developed at Ames as part of NASA’s Airspace Systems Program, which aims to satisfy the Nation’s plans for a next-generation airspace system. It has the distinction, however, of being the winning software in NASA’s 2006 “Software of the Year” competition.


In 2005, Ames licensed FACET to Flight Explorer Inc., for integration with its Flight Explorer version 6.0 software system. According to the McLean, Virginia-based company, it is the world’s leading provider of real-time global flight tracking information, reporting, and display products. Its clients include over 80 percent of major North American airlines and 22 of the top 30 regional airlines. It also provides a host of free services, including online flight tracking, airport information tools, and daily air travel reports.

The primary FACET features incorporated in the Flight Explorer software system alert airspace users to forecasted demand and capacity imbalances. By having advanced access to this information, dispatchers can anticipate congested sectors (airspace) and delays at airports and decide if they need to reroute flights. Overall, the FACET developers at Ames assert that airspace users can use this information to develop enhanced flightrouting strategies that save fuel, preserve airline schedules, and reduce passenger delays and missed connections.