The one thing I would say is you will need a longer reach lens if you want to get any decent aircraft pics, a 300mm is what most people , myself included use.
So I would be more inclined to get a slightly older camera for less money and invest in a good lens, then when you have enough saved up you can upgrade the camera and still have a good lens..
A ok camera with a good lens will get you better results than a good camera with a ok lens......