Mostly a good article. This part, however, is not in keeping with practical experience and history:
For several reasons — particularly the awareness of passengers and crew — just the opposite is true today. Any hijacker would face a planeload of angry and frightened people ready to fight back. Say what you want of terrorists, they cannot afford to waste time and resources on schemes with a high probability of failure. And thus the September 11th template is all but useless to potential hijackers.
He states it as if it's categorically true, which it is not. That somehow hundreds of people who have never met before are going to, without the benefit of training or planning or anything else, jump up simultaneously and kick a$$.
There is no hgh probability of failure. And they will hijack again, just like they have been doing for decades and decades, even after spectacular failures, much less their most impressive success.