You may know how to fly a plane, and you may have gotten your pilots license, but do you know enough about planes to buy one? You can always go out and test drive a car to decide if it is something that you want to buy, but do you want to run the risk of taking airplanes for sale up in the air to be sure they are fine? That is a tad bit more risky, to say the least, so you have to know what to look for on the ground before you...