If I understand things correctly, the blueprints for the building were not deemed to be classified. I'm not an expert in this, but it seems to me that the attack on September 11 by al-Qaeda was based on a good deal of knowledge about the design and structure of the towers and the effect of a plane crashing into those buildings: the pancaking effect on the building and so on.
It would seem to me—I don't want to sound like a Maxwell Smart or somebody—that if you're designing something for NORAD, it would be highly critical that the building be free of any risk from terrorists attacks, or that you would attempt to minimize the risk. To have blueprints out in the public domain would just be an invitation for these people to know what the design vulnerabilities of these buildings are.
Am I missing something here, or can you satisfy me on this point? It seems to me rather odd or strange that blueprints would not be classified information.