[HairOfTheDog]

Just to add to that.... VFR planes are not required to even have their transponders ~on~, though most ~do~ as a smart practice to help themselves to be seen. An aircraft without a transponder over a rural area may not be seen until he is quite high.... more than a few thousand feet.

[Calpernia]

You have to be kidding me. OMG, Jstolzen, see http://www.freerepublic.com/focus/news/1013726/posts?page=9502#9502

[WestCoastGal]

That's why after 9-11 many small aircraft and especially crop dusters were grounded for a long time.