Boeing made this announcement:
Boeing and Alaska Airlines announced today they are partnering on the latest Boeing ecoDemonstrator program and will flight test about 20 technologies on a new 737-9 to enhance the safety and sustainability of air travel.
In flights beginning this summer, Boeing and Alaska will test a new halon-free fire-extinguishing agent that significantly reduces effects on the ozone layer, evaluate an engine nacelle designed to reduce noise and assess cabin sidewalls made from recycled material, among other projects.
Since 2012, the ecoDemonstrator program has accelerated innovation by taking nearly 200 promising technologies out of the lab and testing them in the air to address challenges for the aviation industry and improve the passenger experience.