[Poohbah]

Personally, I believe that there is a good chance of it hapening.

It could be a radio controlled model airplane.

My estimate is that they need something significantly bigger, because chem/bio agent lethality is proportionate to the dose received. One R/C model airplane can hold a very small amount of agent, which means its lethal footprint is going to be very small. A larger plane (such as a cropduster) can hold much more agent, nmaking the lethal footprint much larger.

[FairOpinion]

"One R/C model airplane can hold a very small amount of agent, which means its lethal footprint is going to be very small."
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Suppose they get a 100 toy-airplanes and release each over school yards during recess, parks, beaches, a sports event, and maybe millions won't die, but thousands will. Just think of the panic that would cause. Just think of the panic a few letters with anthrax and deaths in single digits caused. (Every death is important, I don't try to minimize the loss of life during the anthrax attacks, but I am just trying to put it in context.) They don't need to kill millions, although they may. There are some of these chemical weapons, which stick to surfaces, and less than a milligram is lethal. And of course there are the biological weapons, like smallpox, where it may not be discovered until days later, by which time many more people are infected. The "Dark Winter" sallpox attack simulation started with just a few infected cases in I think just one city, and when they stopped it, worst case, there were over a million dead.

[farmguy]

Knew some folks that worked for a Texas autopilot company that built these things for what they described as being a "commercial customer".

All the control servos were standard RC stuff right from a hobby shop. Used a 20 hp two cycle (big weed eater) engine. Could do fully autonomic flight for eight hours on internal autopilot (slaved to GPS). Could carry ~100 lb payload. Cost about $15k to build.