This is a trickie question to answer. Not because I don't use the Nikon D7000 with the 18-105mm lens, but because I don't know which day or, or time of day or season for that matter, you plan on using the camera and what the prevailing weather conditions are going to be at that time.
You may ask what has that got to do with how you set the camera up, alot really. If you are photographing aircraft early in the morning on an overcast day or if you are photographing aircraft, early morning on a bright sunny day you will need to use different settings and judgement while using your camera to get acceptable results for the two situations I mentioned here. In reality there are an infinite number of variables. The main one's are is it in focus, well exposed, well framed, eye catching angle, unique subject matter, creative etc, etc.
Shoot early morning or early evening, best time, magic hour, if midday, and it's mid summer, not so good. However there is an exception to every rule, shooting midday in winter is fine, that's if the sun decides to show, it will remain low, which is good! All this comes with experience.
If you are shooting in low light, then you will need to select a high ASA or ISO setting. Or if your 18-105mm is a fast lens, i.e. has a low f-stop aperture setting, then you can select a relatively low ASA/ISO setting keeping the noise in the photo to minimum. A good thing by the way, or maybe you have software that can remove noise all together, then a low ASA/ISO setting is not so critical.
Does your particular lens you use, have a sweet spot? A dedicated photographer intent on taking quality photo's will go out and find what that sweet spot is i.e. the f-stop setting which gives the sharpest images. To find this out, use your camera and lens in different scenario's, clear day, overcast day, change settings, i.e.use high and low f-stops, then view the results on a decent monitor to judge which setting gave the best results. Get a second opinion if need be. Read reviews to see what other users have found through their own experiences.
Once you have found your lens sweet spot then try to use it at that setting, which will require you to use Av Priority setting and let your shutter go high and low depending on the available light and the amount of zoom you use. Having said that staying at that f-spot sweet spot is still only optional, it's still up to you to decide and as I have said that comes with knowledge and experience.
Also read books on photography, and get to know your camera by reading the manual. Search past discussions on A.net photography forum regarding how to take great aircraft photo's. It all helps!
Ultimately, I hope this gives you a basic impression of how variable your camera settings will be on any given day.
[Edited 2012-09-03 15:07:19]