The Department of Homeland Security this week warned airlines to be on the lookout for shoe bombs on US-bound flights. Intelligence points to a possibility that new shoe-bomb technology may be out there.
Full-body scanners could have foiled the Christmas Day airline bomb plot, some experts say. In 2010, US airports will add at least 150 to the 40 already in use, the TSA says. But critics say the machines won't help.
From 9/11 to the Christmas Day attack on Northwest Flight 253 over Detroit, terrorists have changed their tactics to get around airport security.
Airline passengers across Europe faced body searches and new limits on hand luggage. Authorities say that Umar Farouk Abdul Mutallab of Nigeria flew from Lagos to Amsterdam before boarding Northwest Airlines Flight 253 for Detroit.