[eno_]

Here is a mainstream media report, with eyewitnesses and describing an FBI search that turned up, among other things, human remains several miles from the main impact:
http://post-gazette.com/headlines/20010913somersetp3.asp

There are two plausible explanations: The terrorists had a bomb, or the plane was shot down. Everything else requires Costco-size rolls of tinfoil and denial of reality.

[cyncooper]

Even in your article it says:

In response to a question on recurring rumors that the plane might have been shot down, Crowley said that at this stage of the investigation, no possibility was being ruled out. He stressed, however, that no evidence had surfaced to support that theory.

And of course, it never did.

[Pukka Puck]

"In response to a question on recurring rumors that the plane might have been shot down, Crowley said that at this stage of the investigation, no possibility was being ruled out. He stressed, however, that no evidence had surfaced to support that theory."

From your site.

No evidence.