Entries Tagged "TSA"

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No-Fly List Exposed

I can’t remember the last time I thought about the US no-fly list: the list of people so dangerous they should never be allowed to fly on an airplane, yet so innocent that we can’t arrest them. Back when I thought about it a lot, I realized that the TSA’s practice of giving it to every airline meant that it was not well protected, and it certainly ended up in the hands of every major government that wanted it.

The list is back in the news today, having been left exposed on an insecure airline computer. (The airline is CommuteAir, a company so obscure that I’ve never heard of it before.)

This is, of course, the problem with having to give a copy of your secret list to lots of people.

EDITED TO ADD (2/14): The 23 yo researcher who found NOFLY.csv wrote a blog post about it. This is not the first time the list has become public.

Posted on January 23, 2023 at 7:02 AM • View Comments

TSA Admits Liquid Ban Is Security Theater

The TSA is allowing people to bring larger bottles of hand sanitizer with them on airplanes:

Passengers will now be allowed to travel with containers of liquid hand sanitizer up to 12 ounces. However, the agency cautioned that the shift could mean slightly longer waits at checkpoint because the containers may have to be screened separately when going through security.

Won’t airplanes blow up as a result? Of course not.

Would they have blown up last week were the restrictions lifted back then? Of course not.

It’s always been security theater.

Interesting context:

The TSA can declare this rule change because the limit was always arbitrary, just one of the countless rituals of security theater to which air passengers are subjected every day. Flights are no more dangerous today, with the hand sanitizer, than yesterday, and if the TSA allowed you to bring 12 ounces of shampoo on a flight tomorrow, flights would be no more dangerous then. The limit was bullshit. The ease with which the TSA can toss it aside makes that clear.

All over America, the coronavirus is revealing, or at least reminding us, just how much of contemporary American life is bullshit, with power structures built on punishment and fear as opposed to our best interest. Whenever the government or a corporation benevolently withdraws some punitive threat because of the coronavirus, it’s a signal that there was never any good reason for that threat to exist in the first place.

Posted on March 16, 2020 at 9:31 AM • View Comments

Terahertz Millimeter-Wave Scanners

Interesting article on terahertz millimeter-wave scanners and their uses to detect terrorist bombers.

The heart of the device is a block of electronics about the size of a 1990s tower personal computer. It comes housed in a musician’s black case, akin to the one Spinal Tap might use on tour. At the front: a large, square white plate, the terahertz camera and, just above it, an ordinary closed-circuit television (CCTV) camera. Mounted on a shelf inside the case is a laptop that displays the CCTV image and the blobby terahertz image side by side.

An operator compares the two images as people flow past, looking for unexplained dark areas that could represent firearms or suicide vests. Most images that might be mistaken for a weapon­—backpacks or a big patch of sweat on the back of a person’s shirt­—are easily evaluated by observing the terahertz image alongside an unaltered video picture of the passenger.

It is up to the operator­—in LA’s case, presumably a transport police officer­—to query people when dark areas on the terahertz image suggest concealed large weapons or suicide vests. The device cannot see inside bodies, backpacks or shoes. “If you look at previous incidents on public transit systems, this technology would have detected those,” Sotero says, noting LA Metro worked “closely” with the TSA for over a year to test this and other technologies. “It definitely has the backing of TSA.”

How the technology works in practice depends heavily on the operator’s training. According to Evans, “A lot of tradecraft goes into understanding where the threat item is likely to be on the body.” He sees the crucial role played by the operator as giving back control to security guards and allowing them to use their common sense.

I am quoted in the article as being skeptical of the technology, particularly how its deployed.

Posted on October 3, 2018 at 7:11 AM • View Comments

Don't Fear the TSA Cutting Airport Security. Be Glad That They're Talking about It.

Last week, CNN reported that the Transportation Security Administration is considering eliminating security at U.S. airports that fly only smaller planes—60 seats or fewer. Passengers connecting to larger planes would clear security at their destinations.

To be clear, the TSA has put forth no concrete proposal. The internal agency working group’s report obtained by CNN contains no recommendations. It’s nothing more than 20 people examining the potential security risks of the policy change. It’s not even new: The TSA considered this back in 2011, and the agency reviews its security policies every year. But commentary around the news has been strongly negative. Regardless of the idea’s merit, it will almost certainly not happen. That’s the result of politics, not security: Sen. Charles E. Schumer (D-N.Y.), one of numerous outraged lawmakers, has already penned a letter to the agency saying that “TSA documents proposing to scrap critical passenger security screenings, without so much as a metal detector in place in some airports, would effectively clear the runway for potential terrorist attacks.” He continued, “It simply boggles the mind to even think that the TSA has plans like this on paper in the first place.”

We don’t know enough to conclude whether this is a good idea, but it shouldn’t be dismissed out of hand. We need to evaluate airport security based on concrete costs and benefits, and not continue to implement security theater based on fear. And we should applaud the agency’s willingness to explore changes in the screening process.

There is already a tiered system for airport security, varying for both airports and passengers. Many people are enrolled in TSA PreCheck, allowing them to go through checkpoints faster and with less screening. Smaller airports don’t have modern screening equipment like full-body scanners or CT baggage screeners, making it impossible for them to detect some plastic explosives. Any would-be terrorist is already able to pick and choose his flight conditions to suit his plot.

Over the years, I have written many essays critical of the TSA and airport security, in general. Most of it is security theater—measures that make us feel safer without improving security. For example, the liquids ban makes no sense as implemented, because there’s no penalty for repeatedly trying to evade the scanners. The full-body scanners are terrible at detecting the explosive material PETN if it is well concealed—which is their whole point.

There are two basic kinds of terrorists. The amateurs will be deterred or detected by even basic security measures. The professionals will figure out how to evade even the most stringent measures. I’ve repeatedly said that the two things that have made flying safer since 9/11 are reinforcing the cockpit doors and persuading passengers that they need to fight back. Everything beyond that isn’t worth it.

It’s always possible to increase security by adding more onerous—and expensive—procedures. If that were the only concern, we would all be strip-searched and prohibited from traveling with luggage. Realistically, we need to analyze whether the increased security of any measure is worth the cost, in money, time and convenience. We spend $8 billion a year on the TSA, and we’d like to get the most security possible for that money.

This is exactly what that TSA working group was doing. CNN reported that the group specifically evaluated the costs and benefits of eliminating security at minor airports, saving $115 million a year with a “small (nonzero) undesirable increase in risk related to additional adversary opportunity.” That money could be used to bolster security at larger airports or to reduce threats totally removed from airports.

We need more of this kind of thinking, not less. In 2017, political scientists Mark Stewart and John Mueller published a detailed evaluation of airport security measures based on the cost to implement and the benefit in terms of lives saved. They concluded that most of what our government does either isn’t effective at preventing terrorism or is simply too expensive to justify the security it does provide. Others might disagree with their conclusions, but their analysis provides enough detailed information to have a meaningful argument.

The more we politicize security, the worse we are. People are generally terrible judges of risk. We fear threats in the news out of proportion with the actual dangers. We overestimate rare and spectacular risks, and underestimate commonplace ones. We fear specific “movie-plot threats” that we can bring to mind. That’s why we fear flying over driving, even though the latter kills about 35,000 people each year—about a 9/11’s worth of deaths each month. And it’s why the idea of the TSA eliminating security at minor airports fills us with fear. We can imagine the plot unfolding, only without Bruce Willis saving the day.

Very little today is immune to politics, including the TSA. It drove most of the agency’s decisions in the early years after the 9/11 terrorist attacks. That the TSA is willing to consider politically unpopular ideas is a credit to the organization. Let’s let them perform their analyses in peace.

This essay originally appeared in the Washington Post.

Posted on August 10, 2018 at 6:10 AM • View Comments

Extending the Airplane Laptop Ban

The Department of Homeland Security is rumored to be considering extending the current travel ban on large electronics for Middle Eastern flights to European ones as well. The likely reaction of airlines will be to implement new traveler programs, effectively allowing wealthier and more frequent fliers to bring their computers with them. This will only exacerbate the divide between the haves and the have-nots—all without making us any safer.

In March, both the United States and the United Kingdom required that passengers from 10 Muslim countries give up their laptop computers and larger tablets, and put them in checked baggage. The new measure was based on reports that terrorists would try to smuggle bombs onto planes concealed in these larger electronic devices.

The security measure made no sense for two reasons. First, moving these computers into the baggage holds doesn’t keep them off planes. Yes, it is easier to detonate a bomb that’s in your hands than to remotely trigger it in the cargo hold. But it’s also more effective to screen laptops at security checkpoints than it is to place them in checked baggage. TSA already does this kind of screening randomly and occasionally: making passengers turn laptops on to ensure that they’re functional computers and not just bomb-filled cases, and running chemical tests on their surface to detect explosive material.

And, two, banning laptops on selected flights just forces terrorists to buy more roundabout itineraries. It doesn’t take much creativity to fly Doha-Amsterdam-New York instead of direct. Adding Amsterdam to the list of affected airports makes the terrorist add yet another itinerary change; it doesn’t remove the threat.

Which brings up another question: If this is truly a threat, why aren’t domestic flights included in this ban? Remember that anyone boarding a plane to the United States from these Muslim countries has already received a visa to enter the country. This isn’t perfect security—the infamous underwear bomber had a visa, after all—but anyone who could detonate a laptop bomb on his international flight could do it on his domestic connection.

I don’t have access to classified intelligence, and I can’t comment on whether explosive-filled laptops are truly a threat. But, if they are, TSA can set up additional security screenings at the gates of US-bound flights worldwide and screen every laptop coming onto the plane. It wouldn’t be the first time we’ve had additional security screening at the gate. And they should require all laptops to go through this screening, prohibiting them from being stashed in checked baggage.

This measure is nothing more than security theater against what appears to be a movie-plot threat.

Banishing laptops to the cargo holds brings with it a host of other threats. Passengers run the risk of their electronics being stolen from their checked baggage—something that has happened in the past. And, depending on the country, passengers also have to worry about border control officials intercepting checked laptops and making copies of what’s on their hard drives.

Safety is another concern. We’re already worried about large lithium-ion batteries catching fire in airplane baggage holds; adding a few hundred of these devices will considerably exacerbate the risk. Both FedEx and UPS no longer accept bulk shipments of these batteries after two jets crashed in 2010 and 2011 due to combustion.

Of course, passengers will rebel against this rule. Having access to a computer on these long transatlantic flights is a must for many travelers, especially the high-revenue business-class travelers. They also won’t accept the delays and confusion this rule will cause as it’s rolled out. Unhappy passengers fly less, or fly other routes on other airlines without these restrictions.

I don’t know how many passengers are choosing to fly to the Middle East via Toronto to avoid the current laptop ban, but I suspect there may be some. If Europe is included in the new ban, many more may consider adding Canada to their itineraries, as well as choosing European hubs that remain unaffected.

As passengers voice their disapproval with their wallets, airlines will rebel. Already Emirates has a program to loan laptops to their premium travelers. I can imagine US airlines doing the same, although probably for an extra fee. We might learn how to make this work: keeping our data in the cloud or on portable memory sticks and using unfamiliar computers for the length of the flight.

A more likely response will be comparable to what happened after the US increased passenger screening post-9/11. In the months and years that followed, we saw different ways for high-revenue travelers to avoid the lines: faster first-class lanes, and then the extra-cost trusted traveler programs that allow people to bypass the long lines, keep their shoes on their feet and leave their laptops and liquids in their bags. It’s a bad security idea, but it keeps both frequent fliers and airlines happy. It would be just another step to allow these people to keep their electronics with them on their flight.

The problem with this response is that it solves the problem for frequent fliers, while leaving everyone else to suffer. This is already the case; those of us enrolled in a trusted traveler program forget what it’s like to go through “normal” security screening. And since frequent fliers—likely to be more wealthy—no longer see the problem, they don’t have any incentive to fix it.

Dividing security checks into haves and have-nots is bad social policy, and we should actively fight any expansion of it. If the TSA implements this security procedure, it should implement it for every flight. And there should be no exceptions. Force every politically connected flier, from members of Congress to the lobbyists that influence them, to do without their laptops on planes. Let the TSA explain to them why they can’t work on their flights to and from D.C.

This essay previously appeared on CNN.com.

EDITED TO ADD: US officials are backing down.

Posted on May 22, 2017 at 6:06 AM • View Comments

Why Is the TSA Scanning Paper?

I’ve been reading a bunch of anecdotal reports that the TSA is starting to scan paper separately:

A passenger going through security at Kansas City International Airport (MCI) recently was asked by security officers to remove all paper products from his bag. Everything from books to Post-It Notes, documents and more. Once the paper products were removed, the passenger had to put them in a separate bin to be scanned separately.

When the passenger inquired why he was being forced to remove the paper products from his carry-on bag, the agent told him that it was a pilot program that’s being tested at MCI and will begin rolling out nationwide. KSHB Kansas City is reporting that other passengers traveling through MCI have also reported the paper-removal procedure at the airport. One person said that security dug through the suitcase for two “blocks” of Post-It Notes at the bottom.

Does anyone have any guesses as to why the TSA is doing this?

EDITED TO ADD (5/11): This article says that the TSA has stopped doing this. They blamed it on their contractor, Akai Security.

Posted on May 5, 2017 at 7:35 AM • View Comments

The TSA's Selective Laptop Ban

Last Monday, the TSA announced a peculiar new security measure to take effect within 96 hours. Passengers flying into the US on foreign airlines from eight Muslim countries would be prohibited from carrying aboard any electronics larger than a smartphone. They would have to be checked and put into the cargo hold. And now the UK is following suit.

It’s difficult to make sense of this as a security measure, particularly at a time when many people question the veracity of government orders, but other explanations are either unsatisfying or damning.

So let’s look at the security aspects of this first. Laptop computers aren’t inherently dangerous, but they’re convenient carrying boxes. This is why, in the past, TSA officials have demanded passengers turn their laptops on: to confirm that they’re actually laptops and not laptop cases emptied of their electronics and then filled with explosives.

Forcing a would-be bomber to put larger laptops in the plane’s hold is a reasonable defense against this threat, because it increases the complexity of the plot. Both the shoe-bomber Richard Reid and the underwear bomber Umar Farouk Abdulmutallab carried crude bombs aboard their planes with the plan to set them off manually once aloft. Setting off a bomb in checked baggage is more work, which is why we don’t see more midair explosions like Pan Am Flight 103 over Lockerbie, Scotland, in 1988.

Security measures that restrict what passengers can carry onto planes are not unprecedented either. Airport security regularly responds to both actual attacks and intelligence regarding future attacks. After the liquid bombers were captured in 2006, the British banned all carry-on luggage except passports and wallets. I remember talking with a friend who traveled home from London with his daughters in those early weeks of the ban. They reported that airport security officials confiscated every tube of lip balm they tried to hide.

Similarly, the US started checking shoes after Reid, installed full-body scanners after Abdulmutallab and restricted liquids in 2006. But all of those measures were global, and most lessened in severity as the threat diminished.

This current restriction implies some specific intelligence of a laptop-based plot and a temporary ban to address it. However, if that’s the case, why only certain non-US carriers? And why only certain airports? Terrorists are smart enough to put a laptop bomb in checked baggage from the Middle East to Europe and then carry it on from Europe to the US.

Why not require passengers to turn their laptops on as they go through security? That would be a more effective security measure than forcing them to check them in their luggage. And lastly, why is there a delay between the ban being announced and it taking effect?

Even more confusing, the New York Times reported that “officials called the directive an attempt to address gaps in foreign airport security, and said it was not based on any specific or credible threat of an imminent attack.” The Department of Homeland Security FAQ page makes this general statement, “Yes, intelligence is one aspect of every security-related decision,” but doesn’t provide a specific security threat. And yet a report from the UK states the ban “follows the receipt of specific intelligence reports.”

Of course, the details are all classified, which leaves all of us security experts scratching our heads. On the face of it, the ban makes little sense.

One analysis painted this as a protectionist measure targeted at the heavily subsidized Middle Eastern airlines by hitting them where it hurts the most: high-paying business class travelers who need their laptops with them on planes to get work done. That reasoning makes more sense than any security-related explanation, but doesn’t explain why the British extended the ban to UK carriers as well. Or why this measure won’t backfire when those Middle Eastern countries turn around and ban laptops on American carriers in retaliation. And one aviation official told CNN that an intelligence official informed him it was not a “political move.”

In the end, national security measures based on secret information require us to trust the government. That trust is at historic low levels right now, so people both in the US and other countries are rightly skeptical of the official unsatisfying explanations. The new laptop ban highlights this mistrust.

This essay previously appeared on CNN.com.

EDITED TO ADD: Here are two essays that look at the possible political motivations, and fallout, of this ban. And the EFF rightly points out that letting a laptop out of your hands and sight is itself a security risk—for the passenger.

EDITED TO ADD (4/12): This article suggests that the ban is because of a plot to hide explosives in iPads.

Posted on March 27, 2017 at 6:28 AM • View Comments

Security Risks of TSA PreCheck

Former TSA Administrator Kip Hawley wrote an op-ed pointing out the security vulnerabilities in the TSA’s PreCheck program:

The first vulnerability in the system is its enrollment process, which seeks to verify an applicant’s identity. We know verification is a challenge: A 2011 Government Accountability Office report on TSA’s system for checking airport workers’ identities concluded that it was “not designed to provide reasonable assurance that only qualified applicants” got approved. It’s not a stretch to believe a reasonably competent terrorist could construct an identity that would pass PreCheck’s front end.

The other step in PreCheck’s “intelligence-driven, risk-based security strategy” is absurd on its face: The absence of negative information about a person doesn’t mean he or she is trustworthy. News reports are filled with stories of people who seemed to be perfectly normal right up to the moment they committed a heinous act. There is no screening algorithm and no database check that can accurately predict human behavior—especially on the scale of millions. It is axiomatic that terrorist organizations recruit operatives who have clean backgrounds and interview well.

None of this is news.

Back in 2004, I wrote:

Imagine you’re a terrorist plotter with half a dozen potential terrorists at your disposal. They all apply for a card, and three get one. Guess which are going on the mission? And they’ll buy round-trip tickets with credit cards and have a “normal” amount of luggage with them.

What the Trusted Traveler program does is create two different access paths into the airport: high security and low security. The intent is that only good guys will take the low-security path, and the bad guys will be forced to take the high-security path, but it rarely works out that way. You have to assume that the bad guys will find a way to take the low-security path.

The Trusted Traveler program is based on the dangerous myth that terrorists match a particular profile and that we can somehow pick terrorists out of a crowd if we only can identify everyone. That’s simply not true. Most of the 9/11 terrorists were unknown and not on any watch list. Timothy McVeigh was an upstanding US citizen before he blew up the Oklahoma City Federal Building. Palestinian suicide bombers in Israel are normal, nondescript people. Intelligence reports indicate that Al Qaeda is recruiting non-Arab terrorists for US operations.

I wrote much the same thing in 2007:

Background checks are based on the dangerous myth that we can somehow pick terrorists out of a crowd if we could identify everyone. Unfortunately, there isn’t any terrorist profile that prescreening can uncover. Timothy McVeigh could probably have gotten one of these cards. So could have Eric Rudolph, the pipe bomber at the 1996 Olympic Games in Atlanta. There isn’t even a good list of known terrorists to check people against; the government list used by the airlines has been the butt of jokes for years.

And have we forgotten how prevalent identity theft is these days? If you think having a criminal impersonating you to your bank is bad, wait until they start impersonating you to the Transportation Security Administration.

The truth is that whenever you create two paths through security—a high-security path and a low-security path—you have to assume that the bad guys will find a way to exploit the low-security path. It may be counterintuitive, but we are all safer if the people chosen for more thorough screening are truly random and not based on an error-filled database or a cursory background check.

In a companion blog post, Hawley has more details about why the program doesn’t work:

In the sense that PreCheck bars people who were identified by intelligence or law enforcement agencies as possible terrorists, then it was intelligence-driven. But using that standard for PreCheck is ridiculous since those people already get extra screening or are on the No-Fly list. The movie Patriots Day, out now, reminds us of the tragic and preventable Boston Marathon bombing. The FBI sent agents to talk to the Tsarnaev brothers and investigate them as possible terror suspects. And cleared them. Even they did not meet the “intelligence-driven” definition used in PreCheck.

The other problem with “intelligence-driven” in the PreCheck context is that intelligence actually tells us the opposite; specifically that terrorists pick clean operatives. If TSA uses current intelligence to evaluate risk, it would not be out enrolling everybody they can into pre-9/11 security for everybody not flagged by the security services.

Hawley and I may agree on the problem, but we have completely opposite solutions. The op-ed was too short to include details, but they’re in a companion blog post. Basically, he wants to screen PreCheck passengers more:

In the interests of space, I left out details of what I would suggest as short-and medium-term solutions. Here are a few ideas:

  • Immediately scrub the PreCheck enrollees for false identities. That can probably be accomplished best and most quickly by getting permission from members, and then using, commercial data. If the results show that PreCheck has already been penetrated, the program should be suspended.
  • Deploy K-9 teams at PreCheck lanes.
  • Use Behaviorally trained officers to interact with and check the credentials of PreCheck passengers.
  • Use Explosives Trace Detection cotton swabs on PreCheck passengers at a much higher rate. Same with removing shoes.
  • Turn on the body scanners and keep them fully utilized.
  • Allow liquids to stay in the carry-on since TSA scanners can detect threat liquids.
  • Work with the airlines to keep the PreCheck experience positive.
  • Work with airports to place PreCheck lanes away from regular checkpoints so as not to diminish lane capacity for non-PreCheck passengers. Rental Car check-in areas could be one alternative. Also, downtown check-in and screening (with secure transport to the airport) is a possibility.

These solutions completely ignore the data from the real-world experiment PreCheck has been. Hawley writes that PreCheck tells us that “terrorists pick clean operatives.” That’s exactly wrong. PreCheck tells us that, basically, there are no terrorists. If 1) it’s an easier way through airport security that terrorists will invariably use, and 2) there have been no instances of terrorists using it in the 10+ years it and its predecessors have been in operation, then the inescapable conclusion is that the threat is minimal. Instead of screening PreCheck passengers more, we should screen everybody else less. This is me in 2012: “I think the PreCheck level of airport screening is what everyone should get, and that the no-fly list and the photo ID check add nothing to security.”

I agree with Hawley that we need to overhaul airport security. Me in 2010: “Airport security is the last line of defense, and it’s not a very good one.” We need to recognize that the actual risk is much lower than we fear, and ratchet airport security down accordingly. And then we need to continue to invest in investigation and intelligence: security measures that work regardless of the tactic or target.

Posted on December 27, 2016 at 6:11 AM • View Comments

Good Article on Airport Security

The New York Times wrote a good piece comparing airport security around the world, and pointing out that moving the security perimeter doesn’t make any difference if the attack can occur just outside the perimeter. Mark Stewart has the good quote:

“Perhaps the most cost-effective measure is policing and intelligence—to stop them before they reach the target,” Mr. Stewart said.

Sounds like something I would say.

Posted on July 6, 2016 at 9:45 AM • View Comments

Security Analysis of TSA PreCheck

Interesting research: Mark G. Stewart and John Mueller, “Risk-based passenger screening: risk and economic assessment of TSA PreCheck increased security at reduced cost?”

Executive Summary: The Transportation Security Administration’s PreCheck program is risk-based screening that allows passengers assessed as low risk to be directed to expedited, or PreCheck, screening. We begin by modelling the overall system of aviation security by considering all layers of security designed to deter or disrupt a terrorist plot to down an airliner with a passenger-borne bomb. Our analysis suggests that these measures reduce the risk of such an attack by at least 98%. Assuming that the accuracy of Secure Flight may be less than 100% when identifying low and high risk passengers, we then assess the effect of enhanced and expedited (or regular and PreCheck) screening on deterrence and disruption rates. We also evaluate programs that randomly redirect passengers from the PreCheck to the regular lines (random exclusion) and ones that redirect some passengers from regular to PreCheck lines (managed inclusion). We find that, if 50% of passengers are cleared for PreCheck, the additional risk reduction (benefit) due to PreCheck is 0.021% for attacks by lone wolves, and 0.056% for ones by terrorist organisations. If 75% of passengers rather than 50% go through PreCheck, these numbers are 0.017% and 0.044%, still providing a benefit in risk reduction. Under most realistic combinations of parameter values PreCheck actually increases risk reduction, perhaps up to 1%, while under the worst assumptions, it lowers risk reduction only by some 0.1%. Extensive sensitivity analyses suggests that, overall, PreCheck is most likely to have an increase in overall benefit.

The report also finds that adding random exclusion and managed inclusion to the PreCheck program has little effect on the risk reducing capability of PreCheck one way or the other. For example, if 10% of non-PreCheck passengers are randomly sent to the PreCheck line, the program still is delivers a benefit in risk reduction, and provides an additional savings for TSA of $11 million per year by reducing screening costs—while at the same time improving security outcomes.

There are also other co-benefits, and these are very substantial. Reducing checkpoint queuing times improves in the passenger experience, which would lead to higher airline revenues, can exceed several billion dollars per year. TSA PreCheck thus seems likely to bring considerable efficiencies to the screening process and great benefits to passengers, airports, and airlines while actually enhancing security a bit.

Posted on June 28, 2016 at 2:10 PM • View Comments

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Sidebar photo of Bruce Schneier by Joe MacInnis.