(Tribune Media Services) -- If you thought airlines had wacky rules, try renting a car.

Like airlines, car rental companies don't think twice about changing your rate. Except that they sometimes raise the price after you've driven off the lot.

Like airlines, car rental companies are astonishingly creative with their fees, from additional driver add-on costs to premiums for customers under the age of 25. There's even a down-to-earth equivalent of the cramped regional jet: Car rental companies are quietly redefining their vehicle sizes in an apparent attempt to lift their profits.

It seems that just about the only thing car rental companies don't have in common with airlines is -- well, cars don't fly.

http://www.cnn.com/2010/TRAVEL/07/10...une/index.html