In scenes reminiscent of the Middle East, Americans are becoming accustomed to an armed military presence in U.S. airports. President Bush has ordered thousands of National Guard troops to 420 of the country's busiest airports. Guardsmen will perform security duties including aiding in screening of passengers and patrol of airport grounds and facilities.

"We will work . . . to provide visible security measures so the traveling public will know we are serious about airline safety in America," Bush told airline workers recently in Chicago. While the exact number of soldiers deployed for the security detail has yet to be determined, White House officials estimate approximately 4,000 will be deployed in an aviation security role, at a cost of at least $150 million. The Federal government has promised to cover the expenditure.

In addition to security measures, President Bush signed legislation providing an additional $15 billion to the ailing airline industry, on top of $40 billion that was previously approved. The president's plan is said to have broad congressional support.