NASA Tech Reduces Aircraft Noise by Up to 70 Percent

Commercial aircraft are big, heavy, and noisy as they fly through the air, but a lot of that noise when they come in for landing is generated by the airframe rather than the engines. NASA decided to try and make aircraft quieter using new technology, and the end result is up to a 70 percent reduction in airframe noise.

https://www.pcmag.com/news/362081/nasa-tech-reduces-aircraft-noise-by-up-to-70-percent