Oh, great. This article was just what I didn't want to read, with some summer airline travel coming up for Laurel and me. However, I did read it, and now will be watching lavatory users with considerable interest. Whether or not you're already nervous or paranoid about flying, your jittery level probably will take an upswing after reading the provocatively titled, "Was an al-Qaeda plot unfolding on Northwest Airlines flight 327?"
P.S. a day later: Thanks to the The One True b!X for pointing out in his comment that the above-cited article was overblown, and that the seeming truth of the matter is much more nuanced (though still disturbing, as this NationalReview.com article nicely discusses).