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So far, the story is holding up. Here's one piece following up. I am seeing LOTS of things from people who say similar things have happened to them. Of course, much of this is hearsay.
This item quotes people who say a considerable number of hijacking plots have been thwarted. Again, not easily confirmed, but I think our defenses are better than we believe.
If an attack is successful, and many people die, it better not turn out that some politically-correct asshole could have prevented it. The backlash would not be pretty.