Please do not take this as a flame, but your question is, IMHO, nearly impossible to answer.
The answer does not lie in what equipment you use, but HOW, you use it, and when.
Like the earlier post said, if you cannot develop (no pun) a feel for aviation photography, then it is time to give up the ghost.
My advice to you, is take your equipment and get out there. Shoot any day that you can. Film is, again, IMHO, cheap. You will learn more by going out, shooting and making mistakes. Then, you will LEARN, how your specific camera reacts to specific light situations.
My Nikon F4 and my Coolpix 990, both are fine cameras, but each of them reacts very differently to light and focus and movement etc...
I went spotting today at a small airport near my house, and for the first time, I tried using ONLY the 990. The results? Well, I think the results were lousy. I might have gotten 1 or 2 usable shots. Will I submit them to here? Maybe, but probably not. I will go out again tomorrow and try some more.
Remember, by rushing your photography skills, just to try to get a couple of shots posted on A-Net, you are doing yourself a disservice, and you will probably get more rejections, then acceptances.