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.
Europe leaders are now reconsidering using full body scanners that they had until recently opposed as lurid and voyeuristic.
Terrorism on 9/11 permanently altered how passengers respond to airline hijackings, rewriting the conventional wisdom that the best way for passengers to stay safe is to stay quiet.
Nigerian Umar Farouk Abdulmutallab, who attempted to bomb a Northwest flight on Christmas day, claims ties to Al Qaeda in Yemen, pressuring the Obama administration's plans to shut down the Guantanamo prison facility. Nearly half of its detainees are from Yemen.
Investigations into where alleged Northwest Airlines bomber Umar Farouk Abdulmutallab got his explosives point toward Yemen and its local Al Qaeda offshoot. Foreign Policy Magazine's latest Failed State Index named Yemen as particularly troubling.
Indian Muslims stretch their hands out for refreshments during a Muharram procession to mark Ashura in Mumbai, India, on Monday. Ashura, which falls on the 10th day of the Islamic month of Muharram, commemorates the death of Imam Hussein, grandson of the prophet Mohammad, who was killed in the 7th-century battle of Kerbala.
Some of the security measures in the wake of the failed Christmas Day terrorist attack on a Detroit-bound international flight are already being eased.
In both cases, passengers and crew subdued the alleged bomber before the explosive material could fully ignite. In the Detroit attack, passengers heard popping noises and saw suspect Umar Farouk Abdulmutallab's pants on fire when they intervened, according to court documents.
The snow-covered Pir Panjal mountain range in Kashmir is seen from the window of an airplane.
Travelers were prohibited from using electronics on international flights this weekend, and in-flight WiFi and TV were banned, but TSA regulations keep changing.