I have to put your mind at ease on the issue of whether composite construction had anything to do with the disappearance of flight MA370. From a structural-weight standpoint, the 777 is primarily an aluminum airplane. Seventy percent of the overall structure is aluminum, including the wing, wing box and fuselage. The significant composite structure on the 777 are the vertical fin, horizontal stabilizers, and passenger-floor beams which utilize a Boeing/supplier developed toughened, damage-resistant carbon fiber epoxy resin system. These components could not cause a catastrophic break up of the aircraft in such a way that communication/tracking systems would be instantaneously severed such that the aircraft would immediately go 'missing'. I believe I have some credibility on this matter as I was a lead structural engineer on the 777 involved in the composite design from its inception to production and delivery. .