Airport noise remains one of the most difficult barriers to continued growth in aviation to overcome. Aircraft are dramatically quieter than they once were, but further reduction are getting harder to achieve. As engines continue to get quieter, airframe noise has emerged as a significant factor. In the Sept. 22 edition of Aviation Week & Space Technology, a report led by Managing Editor for Technology Graham Warwick will delve into efforts in Europe and the US to reduce airframe noise while increasing efficiency. The reoprt also will look at other potential hurdles to achieving the growth projected for air transport.