Take a few test shots and see how well your camera balances the exposure between the sky and plane. Often, you'll find the camera underexposes the plane, obscuring detail. If that's the case, adjust the exposure compensation dial on your camera to overexpose the scene by a stop or so. The sky might end up being brighter and paler than you'd like, but you'll get better exposure and detail in the plane, like in the shot shown here. You can, of course, use some photo editing magic to improve the sky. Read "Make a Dramatically Blue Sky" for tips on doing that.