What's The Difference Between An Airboat And A Snowplane?

Here's one for you: What has a propeller, no wings, skis, is called a plane but never leaves the ground?

Think I'm kidding? Nope. Check out the snowplane, the snowplane and the snowplane. Each a little bit different, but the same thing.

There were some 125 people that held permits to use (no, not fly) them in the Grand Teton National Park. Now, however, they've been (pardon the pun) grounded.

The National Park Service revoked the snowplane permits, but allowed some 50 snowmobiles into GTNP. The NPS said the snowplanes were too loud, and interfered with the values of silence in the Park. I've never heard a snowplane, but I have heard a snowmobile. I've even ridden one. They're like motorcycles on skis. Loud.

I don't know, maybe they thought it was supposed to be like a library. In my law school, we had a sign on the door of our library that said, "If your books have pictures in them, please don't act like it." The NPS apparently doesn't want people to enjoy the Park with machines that make noise.

Wonder what they do in the Everglades with airboats?