Quote Originally Posted by Bill Berson View Post
The floor of the class E "extensions" should logically be higher than the surface. Perhaps 400agl or something for drones and ultralights to operate without prior permission.
Well, they have areas like that, called "Class E transition areas," except they don't use 400'. Where the floor of Class E touches the surface, the powers in charge decided they needed to vertically protect aircraft that are operating in that airspace and that protection extended to the surface.