SEATTLE-Boeing showed off the interior of a 787 Dreamliner parked at Paine Field and provided a glimpse of some advances on the 787 assembly line inside the factory. The partial passenger cabin installed in Dreamliner No. 3 will be used to test elements of the passenger experience, including air flow, noise levels and the heating and emergency oxygen systems. Meals will be prepared in the galley. Toilets will be stress-tested.MORE