[spinestein]

Even the smallest plane weighs several thousand pounds and when flown by a terrorist at a high rate of speed into a dense crowd of civilians will certainly result in the deaths of at least hundreds of people.

This is just from the result of the kinetic energy of a small aircraft plowing through a crowd at 150 mph WITHOUT explosives. If you figure any incendiary device or other dispersal weapons the deaths could be in the thousands.

[Dashing Dasher]

One of my airplanes weights 800 pounds!
It's wood and fabric and wouldn't do much damage to a tree.

I agree with the ban on GA for the day - but wanted you to know there are plenty of tiny aircraft out there that are smaller than you imagine.