I don't know how much time you have before the rally, but I'd say go practice on some birds. Try to find an area where birds are flying, and then try to follow them with your camera. They will be less predictable than the planes, I guess, but that will also help you learn to anticipate the action. The only way to get better at following fast-moving objects is to practice shooting them.
If you have a pan-handle for your sticks, I suggest using it. Better leverage on the pan head will help you move it faster and smoother.