It is only fitting that a structure which stood for 75 years as a place that produced flying machines now finds itself being reduced to rubble and buried right back where it once stood. Such was the fate of Boeing Plant 2, the Seattle facility where over 7,000 B-17 Flying Fortresses and even the very first Boeing 737s rolled off the assembly line. As per the official Duwamish River environmental backgrounder issued by Boeing itself, an estimated 85 percent of the materials in the plant, ranging from steel, wooden beams, copper wire, and concrete, were recovered and reused.