After billions of dollars spent on increased security measures directed against the passengers, nobody has been willing to acknowledge the fact that every single instance of terrorist activity against a U.S. plane has involved help from the inside. This may have changed in the couple of years since I saw the report, but at the time there wasn't a single known instance of someone circumventing the passenger screening to get a device aboard a plane in the U.S.
Once again, we've cracked down on the wrong people, inconveniencing the "little guy" when it's always been someone running the show going rogue.