Apparently American travelers are fed up with "porno scanners" and "groping searches" by TSA agents at airports. Apparently, the head of TSA is tin-eared about it. Apparently, congress postured haughtily on the subject, then did nothing.
Read all about it
My view is that these measures wouldn't have stopped 911 because box-cutters were perfectly legal. They are useless techniques on pilots, who can crash the planes if they wish. Flying was unpleasant already and now it is getting more expensive in order to fund the increasing unpleasantness.
I suppose when the privacy invasion becomes intrusive enough people will stop flying altogether and al Qaeda and TSA can both claim victory.