No need to duck out so quickly. Your contributions to the thread have been both informative and relevant. Apologies in quoting a rather old adage, but:
Now before anyone jumps on the bandwagon, I know that the above quote is often utilised by 'conspiracy theorists'. However, it's particularly relevant in this case.
We know that the movements of the crafts were not possible by any current aviation technology. This means, no man-made technology. It's also extremely likely that we are not alone in the universe and that another planet has developed more intelligent life capable of interstellar travel. This leads one to the logical conclusions that a] aliens exist b] they have the ability to visit us. Ergo these were alien spacecraft [this has not been discounted by the military, they have just said they are 'unidentified aerial phenomena'].