Aircraft noise reduction is actually a pretty big area of research by aviation companies due to noise regulations. Aircraft noise levels limit things like aircraft traffic, takeoff weight, airport zoning etc, so finding ways to reduce it means more money in their pockets.
SiTheGreat t1_jaqe3hu wrote
Reply to comment by blisstaker in Universal Hydrogen Successfully Completes First Flight of Hydrogen Regional Airliner by tooch_my_gooch
Aircraft noise reduction is actually a pretty big area of research by aviation companies due to noise regulations. Aircraft noise levels limit things like aircraft traffic, takeoff weight, airport zoning etc, so finding ways to reduce it means more money in their pockets.