Over the past years, airline executives have claimed that matching luggage to passengers to prevent terrorist attacks would create huge travel nightmares. Now, all U.S. airlines are saying that they can do it. Starting this coming Friday, airlines in the United States will start mathcing bags under a new federal law. Airline officials say that this week is a good time to implement the new security measure because passenger traffic is particularly light in January and February. Before the terrorist attacks, airlines were only required to match the luggage to passengers on international flights.