A Transportation Security Administration volunteer demonstrates a full-body scanner at Chicago's O'Hare International Airport in March 2010. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images

Tight quarters: Aboard a United Airlines Embraer-145, 50-passenger jet. (June 1, 2008 file photo taken at Dulles International Airport.) Paul J. Richards /AFP/Getty Images hide caption

itoggle caption Paul J. Richards /AFP/Getty Images

Julie Capper stands with her hologram at Manchester International Airport. Julie and her hologram work in the same area — which has created some confusion. Courtesy of Manchester International Airport hide caption

itoggle caption Courtesy of Manchester International Airport