http://www.sandisk.com/Corporate/PressRoom/PressReleases/PressRelease.aspx?ID=1419

"Taking Cards Through Airport X-Ray Machines and Metal Detectors: You can put full or empty flash cards in your checked baggage or in your carry-ons with little risk of damage from airport scanners. The International Imaging Industry Association conducted tests last year with security devices used in U.S. airports and found that no damage to the cards resulted with normal travel frequency. As an added precaution, SanDisk recommends that you take the card out of your camera before passing through security devices."