Constitutional of No Fly Zone

If my memory is correct, Presidents Clinton and Bush both had Congressional approval when they requested "No Fly" zones during their administrations. President Obama has only UN approval and the UN does not dictate to us as a sovereign nation with a constitution what our military can or cannot do. Congress must give approval. Is Glenn Beck correct when he says the Obama administration has made Congress irrelevant? If that is the case, we have a constitutional crisis as well as dictator in the making.