The latest US passenger screening programme, Secure Flight, has been suspended due to security concerns. A Government Accountability Office (GAO) audit discovered that the "TSA may not have proper controls in place to protect sensitive information."
The US government's own 'Secure Flight Working Group on Privacy and Security' had already determined as much and more, as had another GAO report. The Working Group's report was originally posted on the TSA website but got removed and replaced with an "Executive Summary" which failed to mention the group's main findings. Bruce Schneier, who was a member of the working group, has more to say on the subject of Secure Flight and aircraft security.