Designing Tomorrow's Air Traffic Control Systems
aarondubrow writes According to FAA estimates, increasing congestion in the air transportation system of the United States, if unaddressed, will cost the American economy $22 billion annually in lost economic activity by 2022. MIT researcher Hamsa Balakrishnan and her team are making air traffic control systems more efficient through a combination of better models and new embedded technologies. Testing their algorithms at Logan Airport in Boston, they showed that by holding aircraft back for 4.5 minutes, they could improve flow on the runways and save nearly 100 pounds of fuel for each aircraft.
The Economist has a great article on free-routing. Not only does this save time & fuel, but a "continuous descent approach" is also quieter at airports.