I have never heard anything about any debris field, as in the engine being "a mile away". According to the flight history, is it not an established fact that the plane was corkscrewed into the ground?

Additionally, why in the world, even if a USAF jet had been scrambled and had found Flight 93, would they down it so far from an urban area?

There is a vast set of protocol regarding military to civilian aircraft interception that would have been in place and well documented long before any missile launch. We are not North Korea, you know.

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