Turns out 6 years prior to 9/11 in light of the first WTC attack (assisted by FBI, http://www.youtube.com/watch?v=7imtps0MQqk), the laptop of Ramzi Yousef found information uncovered information about using planes as weapons and flying them into buildings, specifically the CIA headquarters. So Bush's comments about no one in our government at least, and the prior (Clinton) government, could envision using planes as weapons on such a massive scale, reiterated by Condi Rice several times is false. This in addition to the August 6th PDB and not the plans years earlier.

Here's a video clip of the mention of the planes being used as weapons into the CIA.

Just some other thoughts, just how effective would a hijack be?

2 months before 9/11, an order was issued to rescind a 40 year rule for the ability for pilots to be armed. http://www.wnd.com/news/article.asp?ARTICLE_ID=27647

But whether the pilots were armed would have little effect since pilots are required to be strapped in to their seat, and could simply put the plane in a steep dive or elevation that would throw the hijackers against the wall or the ceiling, but what would certainly through them of their feet.

The little things that are rarely talked about need to be.

Some valuable links

another confirmation by Kristen Breitweiser testimony using planes as weapons

http://www.911blogger.com/node/13127

and

A Blast From the Past: Decoding Bojinka

http://www.911blogger.com/node/14123