[Stiglr]

Toronto's reply is correct. You might need to alter your crease angle (in Settings) so that when you create primitives, they start out looking smooth.

Also, when you're manipulating cylinders to create aircraft bodies, you should try to, as much as possible, scale and move entire rows of vertices at the same time, so that the mesh stays smooth. In the "wrinkled" jet screenshots, I can see a lot of indentations and problems caused possibly by moving independent vertices.

Another suggestion I might make is to model HALF of an aircraft along its nose-to-tail axis, then use the Mirror function to create a 100% symmetrical "other half" near the end of the modeling process. When you're modeling, it's very easy to create problems on one side of the aircraft while fixing problems on the other side. It's VERY HARD to accurately duplicate series of changes equally on both sides, and not lose track of things. The Mirror function allows you to let the computer do it for you.

PM me if you would like some help with this.