[SamAdams76]

Apparently an "experimental" plane crashed into a federal building in Miami.

Don't know what to make of it yet but I guess there is the possibility that this could have been a "trial run" of some kind by the terrorists to see if they could hit a specific target with this sort of contraption. How hard would it be to build a small fleet of "experimental" planes and equip them with high explosives?

[bootless]

The amount of time it takes to build an experimental plane makes it sort of impractical. Easier to buy a factory-built plane, or to buy someone else's experimental plane from them. Kitplanes, Trade-a-Plane, etc. always have ads for someone selling a partially-completed kit or a completed plane ("Honey, it's theplane or me!").

Experimental only means that it was owner-built, not factory built. They usually have more up-to-date technology than the factory-builts.

[Marie Antoinette]

BTW "Experimental" doesn't necessarily mean some wierd, new design or something. If you make a modification, like, say, change the size of the fuel tank on an ultralight from 5 gallons to 11, it becomes experimental and you become a test pilot.