Air travel timeline

Sept. 11, 2001: Terrorists use commercial airliners to attack World Trade Center towers in New York City and other U.S. sites.

Nov. 19, 2001: Federal officials order cockpit doors locked and hardened.

Nov. 19, 2001: The Transportation Security Administration is created to oversee security on all modes of transportation.

Dec. 22, 2001: Terrorist Richard Reid tries to ignite bombs in his shoes aboard a transatlantic flight, prompting shoe inspections at all U.S. airport security checkpoints.

2004: Butane lighters are restricted on commercial planes. Later restrictions are added for all common lighters.

2006: British officials foil a plot to use liquid explosives on planes, prompting restrictions on liquids in carry-on bags.


2008: TSA deploys full-body scanners that can create what looks like a nude image of passengers.

2009: Alleged terrorist Umar Farouk Abdulmutallab attempts to detonate explosives hidden in his underwear, prompting expanded use of explosive detection devices.

2010: TSA orders more thorough pat-down searches on passengers.

2011: TSA tests new software to prevent airport scanners from creating digital nude images of passengers.

Source: TSA