This column is spot on. Read the whole thing. Some choice bits:

Six years after the terrorist attacks of 2001, airport security remains a theater of the absurd. The changes put in place following the September 11th catastrophe have been drastic, and largely of two kinds: those practical and effective, and those irrational, wasteful and pointless.

The first variety have taken place almost entirely behind the scenes.,[…] Unfortunately, at concourse checkpoints all across America, the madness of passenger screening continues in plain view. It began with pat-downs and the senseless confiscation of pointy objects. Then came the mandatory shoe removal, followed in the summer of 2006 by the prohibition of liquids and gels. We can only imagine what is next.

To understand what makes these measures so absurd, we first need to revisit the morning of September 11th, and grasp exactly what it was the 19 hijackers so easily took advantage of. Conventional wisdom says the terrorists exploited a weakness in airport security by smuggling aboard box-cutters. What they actually exploited was a weakness in our mindset — a set of presumptions based on the decades-long track record of hijackings.

In years past, a takeover meant hostage negotiations and standoffs; crews were trained in the concept of “passive resistance.” All of that changed forever the instant American Airlines Flight 11 collided with the north tower. What weapons the 19 men possessed mattered little; the success of their plan relied fundamentally on the element of surprise. And in this respect, their scheme was all but guaranteed not to fail.

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.

No matter that a deadly sharp can be fashioned from virtually anything found on a plane, be it a broken wine bottle or a snapped-off length of plastic, we are content wasting billions of taxpayer dollars and untold hours of labor in a delusional attempt to thwart an attack that has already happened, asked to queue for absurd lengths of time, subject to embarrassing pat-downs and loss of our belongings. (Emph added)

The author — pilot and Salon columnist Patrick Smith — continues, noting once again that the London liquid plot behind the whole “3oz and a baggie” bullshit was implausible in the extreme:

Allegations surrounding the conspiracy were revealed to substantially embellished. In an August, 2006 article in the New York Times, British officials admitted that public statements made following the arrests were overcooked, inaccurate and “unfortunate.” The plot’s leaders were still in the process of recruiting and radicalizing would-be bombers. They lacked passports, airline tickets and, most critical of all, they had been unsuccessful in actually producing liquid explosives. Investigators later described the widely parroted report that up to ten U.S airliners had been targeted as “speculative” and “exaggerated.”

[…]

“The notion that deadly explosives can be cooked up in an airplane lavatory is pure fiction,” Greene told me during an interview. “A handy gimmick for action movies and shows like ’24.’ The reality proves disappointing: it’s rather awkward to do chemistry in an airplane toilet. Nevertheless, our official protectors and deciders respond to such notions instinctively, because they’re familiar to us: we’ve all seen scenarios on television and in the cinema. This, incredibly, is why you can no longer carry a bottle of water onto a plane.”

Again, go read the whole thing. No word of it a lie.