Boeing, NASA Test Improved Engine Nacelle Liner For Lower Drag, Noise Written 28 August 2018

Aviation Week reports that earlier this month, The Boeing Company and NASA tested an “improved engine nacelle liner that offers lower noise as well as reduced drag.” The result comes as engine and airframe manufacturers “wrestle with growing demands for quieter aircraft operations around airports.” The initial trials were completed in early August aboard a Boeing 737-7 prototype, and initial data is “yet to be fully analyzed but already indicate better-than-expected acoustic and aerodynamic performance.”
More Info (Aviation Week)