sentences:  One major program at that time was the microwave landing system, which would allow aircraft to approach from much wider angles and avoid stacking them up over a single approach vector, spreading out the noise.They also demonstrated new engine technologies and stated that the widely used JT8D fleet would be free of smoke by 1972.A combination of these technologies, along with supercritical wings, composites and artificially stable control systems would improve fuel economy of future airliners by 60%.