See this plan. Do not think they are not capable.
http://en.wikipedia.org/wiki/Operation_Northwoods Now when your done there read this one esp part #7. I'm not wanting to open a debate about this here(there are thousands of places I could debate this subject) but just read the links. When a crime is committed ask yourself one question Qui Bono,who benefited.
http://www.ecapc.org/pnac.asp The pertinant info in the original pnac pdf is on page 54 if I remember correctly. I agree its impossible to prove and my beef lays on the things I can prove so I stay clear of 9/11 conspiracy but I do not believe the official story and never will so you'll be wasting your time to convince me otherwise,too much just doesnt add up. Here is a picture of the massive steel bending fire in wtc1. I've had bigger campfires.