Requires the Secretary of Transportation to prohibit any commercial or private aircraft from flying below 18,000 feet: (1) within a ten-mile radius (no-fly zone) of any nuclear facility if the threat alert level determined by the Homeland Security Advisory System is elevated to code orange or code red for the nation (national alert); or (2) within the no-fly zone of any nuclear facility located within a 50-mile radius of a specific area for which the threat alert level is elevated to code orange or code red (local alert).