In this photo taken July 14, 2010, a parking sign referencing the Boeing B-17 Flying Fortress with a silver B-29 in the background is shown at the Boeing Co.'s historic "Plant 2," in Seattle. After giving birth to some of the world's most significant aircraft, the outdated facility is scheduled to be torn down this fall. (AP Photo/Ted S. Warren)

Photo by: Ted S. Warren

In this photo taken July 14, 2010, a parking sign referencing the Boeing B-17 Flying Fortress with a silver B-29 in the background is shown at the Boeing Co.'s historic "Plant 2," in Seattle. After giving birth to some of the world's most significant aircraft, the outdated facility is scheduled to be torn down this fall. (AP Photo/Ted S. Warren)