One witness was a fireman who was stopped by the road near the Pentagon and out of his vehicle. He stated that the plane flew so low above him, he jumped under his car for protection.
There are numerous eyewitnesses to the Pentagon crash. I have met two of them, one on 9/11 and one several months later who told me that she had seen the plane crash into the Pentagon from her apartment in nearby Pentagon City. She spent months in therapy getting over the sight. I personally drove home past the burning Pentagon and smelled the jet fuel. The mother of one of my son's Little League classmates was an Arlington County EMT and she found pieces of the plane in the wreckage, as well as remains of passengers.
"I couldn't find the site where I read this, but I remember that they printed witness statements of the Pentagon attack."
You might have read it here on FR, I've posted this information previously.
I believe this is the article:
http://www.washingtonpost.com/wp-srv/metro/daily/sep01/attack.html