No fly zone is a fiction. Those were not legal and the UN didn't create any. If some hostile foreign country flew over our air space, we'd shoot 'em down too.
“The power to declare war, including the power of judging the causes of war, is fully and exclusively vested in the legislature.” ~ James Madison, Father of the Constitution
“We do not believe in aggressive or preventive war. Such war is the weapon of dictators, not of free democratic countries like the United States.”~ Truman, Sept 1, 1950