For a nation or union of nations other than the U.S.: Identify the government authority or authorities responsible for regulating the national airspace and controlling air traffic. Compare and contrast the categories of airspace with those of the U.S. described in the text. Compare and contrast procedures in use for changing airspace categorizations with those of the U.S. Administrative Procedure Act. If any proposed changes to your answers to the first 2 points above are now under consideration, describe them and evaluate the pros and cons of each. Provide hyperlinks to references relied on.