[Starrgaizr]

Your argument that the crop dusters' tanks were to be filled with fuel seems plausible, except for the fact that even if you want to fly a round trip, you want to know a plane's range. Also, coupled with the hazardous materials trucking anecdotes, it seems to me as if they were in part simply accumulating a diverse set of skills and capabilities to be used as Osama later decided.

[Bikers4Bush]

My personal thought is that we've been putting too much emphasis on the terrorists using biological or chemical weapons.

Not that they didn't want to or weren't developing those methods. Everytime they hit us it was with bombs. Bombs at embassy's, bombing the Cole and in essence bombing the WTC's and Pentagon.

I would have thought that they'd be pushing the development of dirty nukes or worse for use against us in the U.S. instead of working with more difficult methods.