Airport security changed after 9/11 in one fundamental way and dozens of visible ones: Congress took screening out of the airlines’ hands and gave it to a new federal agency, the Transportation Security Administration, which then rebuilt the checkpoint experience from the ground up. If you flew before September 11, 2001, you could reach the gate without showing ID, keep your shoes on through the metal detector, carry a small knife in your pocket, and bring a friend who wasn’t flying right up to the jet bridge. None of that is possible now. What replaced it is a layered system of federal screeners, watchlist checks run before you ever reach the airport, body scanners, restrictions on what fits in your carry-on, and a growing set of biometric tools that photograph your face at the podium.
What Flying Looked Like Before September 11
Pre-9/11 screening was handled by private contractors the airlines hired themselves, usually the lowest bidder, with few federal standards behind them.1NPR. How 9/11 Changed the Way We Travel Aviation security expert Jeff Price described the operating philosophy as security that was meant to be “invisible” and “in the background.”
In practical terms, that meant you could arrive minutes before departure, walk through a basic metal detector with your shoes and coat on, and never show identification or a boarding pass to reach the gate. People not flying were allowed to walk passengers to the departure area.2TSA. This Day in TSA History – November 19, 2001 The FAA did not treat knives with blades under four inches as weapons, so box cutters were legal to bring aboard. The one computerized prescreening system in use, CAPPS, only existed to pull a flagged passenger’s checked bag if they didn’t board. It did not stop them from getting on the plane. Some of the September 11 hijackers set off metal detectors and were cleared after a handheld wand check. The 9/11 Commission later concluded that by 8:00 a.m. that morning, the hijackers had “defeated all the security layers that America’s civil aviation security system then had in place.”1NPR. How 9/11 Changed the Way We Travel
The Law That Created the TSA
Congress moved fast. The Senate passed the Aviation and Transportation Security Act 100–0 on October 11, 2001,3U.S. Senate. Roll Call Vote – S. 1447 and President George W. Bush signed it on November 19, 2001, formally creating the TSA.4TSA. TSA History
The core of the law was federalization. Screening responsibility shifted from airline-hired private companies to a new federal workforce. Congress required TSA to take over passenger screening at 424 of the country’s 429 commercial airports by November 19, 2002, and to have checked-baggage screening running by December 31, 2002. That meant hiring and training roughly 33,000 passenger screeners and 21,600 baggage screeners in under a year.5Reason Foundation. Improving Airport Passenger Screening Five airports were allowed to keep private contractors under federal oversight in a pilot that became the Screening Partnership Program. TSA sat inside the Department of Transportation at first, then moved to the newly created Department of Homeland Security in March 2003.
What You Have to Do at the Checkpoint Now
Most of the checkpoint rules travelers now take for granted were added one attack or plot at a time.
Shoes Off
On December 22, 2001, Richard Reid tried to detonate homemade bombs hidden in his shoes on American Airlines Flight 63 from Paris to Miami. FBI bomb technicians later determined the shoes held about 10 ounces of explosive material, enough to blow a hole in the fuselage.6FBI. Richard Reid’s Shoes Reid pleaded guilty to eight terrorism charges and received a life sentence in October 2002. In August 2006, TSA formally required all passengers to remove their shoes for explosives screening.7TSA. TSA Timeline
The 3-1-1 Liquids Rule
In August 2006, British police disrupted a plot to detonate liquid explosives on at least 10 airliners bound from the United Kingdom to the U.S. and Canada. TSA’s first response was a total ban on liquids, gels, and aerosols in carry-ons. Within weeks, the agency softened that to the 3-1-1 rule: containers of 3.4 ounces or less, all fitting in a single quart-sized clear plastic bag.7TSA. TSA Timeline That rule still governs most checkpoints. TSA’s rollout of computed tomography (CT) scanners is intended to eventually let passengers leave liquids and electronics inside their bags.
Body Scanners
TSA introduced full-body imaging in 2008 using X-ray backscatter machines made by Rapiscan. The images they produced triggered an immediate privacy backlash. Congress required scanners to use Automatic Target Recognition software that shows any potential threat on a generic body outline rather than a real image of the passenger. Rapiscan missed the June 2013 deadline, and TSA pulled all 250 backscatter units. The replacement millimeter-wave scanners use non-ionizing radio frequency waves. By 2016, roughly 800 of them were deployed across nearly 200 airports.8National Academies. Airport Passenger Screening Using Backscatter X-Ray Machines
Enhanced Pat-Downs
In November 2010, TSA introduced what critics called enhanced pat-downs, in which agents make direct physical contact with areas of the body they had previously avoided. The ACLU collected hundreds of complaints from travelers who described the searches as traumatizing and called the procedures “extremely intrusive and humiliating.”9ACLU. What to Expect When Getting the New TSA Pat-Down
How the Government Vets You Before You Fly
The changes at the checkpoint are only the visible half. The other half happens before you leave home. Under the Secure Flight program, authorized by the Intelligence Reform and Terrorism Prevention Act of 2004 and finalized by a rule published October 28, 2008, airlines collect each passenger’s full name, date of birth, and gender, then transmit that data to TSA to be matched against federal watchlists.10Every CRS Report. The No Fly List – Procedural Due Process and Hurdles to Litigation Domestic carriers began cutting over in January 2009 and were fully on the system by June 2010; foreign carriers finished in November 2010.11DHS OIG. Implementation Status of the Secure Flight Program
TSA matches that data against two lists kept by the FBI’s Terrorist Screening Center. People on the No Fly List cannot board. People on the Selectee List get enhanced screening at the checkpoint.10Every CRS Report. The No Fly List – Procedural Due Process and Hurdles to Litigation Placement generally requires “reasonable suspicion” backed by articulable facts, though the No Fly standard is higher and not fully disclosed.
The Due-Process Fight
The original way to challenge inclusion, the DHS Traveler Redress Inquiry Program, gave applicants nothing: the government would not confirm or deny they were listed, would not explain why, and offered no hearing.12Every CRS Report. The No Fly List – Procedural Due Process and Hurdles to Litigation In Latif v. Holder, U.S. citizens and lawful permanent residents sued in federal court in Oregon. In June 2014, Judge Anna Brown ruled that DHS TRIP was “wholly ineffective” and “falls far short of satisfying the requirements of due process.”13Lawfare. Court Demands New Procedures for Challenging No Fly List Determinations The government revised its process. U.S. persons denied boarding now get notice of their status, can ask for an unclassified summary of the basis for inclusion, may submit a written response, and receive a final decision from the TSA Administrator.10Every CRS Report. The No Fly List – Procedural Due Process and Hurdles to Litigation
PreCheck and the Risk-Based Lane
By 2011, the standard checkpoint had accumulated enough friction that TSA introduced a way around it. PreCheck vets willing passengers in advance and lets those who clear a background check use expedited lanes where shoes, belts, and light jackets stay on and laptops and compliant liquids stay in the bag.14U.S. Travel Association. Transforming Security at Airports
Enrollment reached roughly 3.5 million members by 2016, with about 2 million more receiving PreCheck benefits through Customs and Border Protection’s Global Entry program.14U.S. Travel Association. Transforming Security at Airports TSA reports about 99% of PreCheck passengers wait 10 minutes or less. Membership runs roughly $59 to $85 depending on the enrollment provider and whether you are new or renewing, and lasts five years.15TSA. TSA PreCheck Related programs include Global Entry, which adds expedited customs clearance on U.S. arrival and includes PreCheck for a $120 application fee, along with NEXUS for U.S.–Canada travel and SENTRI for land entry from Mexico.16U.S. Customs and Border Protection. Global Entry
Does Any of It Work?
The clearest public answer came in June 2015, when ABC News and NBC News reported that DHS “Red Teams” had smuggled mock explosives or banned weapons past screeners in 67 of 70 attempts, a 95 percent failure rate.17ABC News. Undercover DHS Tests Find Widespread Security Failures at Airports18NBC News. Investigation – Breaches at U.S. Airports Allowed Weapons Through In one test, a screener missed a fake plastic explosive taped to an undercover agent’s back even after an alarm sounded and a pat-down was performed. A separate review found TSA had spent $540 million on checked-baggage screening equipment and $11 million on training since 2009 with no measurable improvement in detection.19DHS OIG. Testimony of Inspector General John Roth – TSA Oversight The Inspector General pointed to human error and failure to follow protocols as persistent problems. Acting Administrator Melvin Carraway was reassigned, and DHS Secretary Jeh Johnson ordered immediate reforms.
Profiling concerns have not gone away either. A 2022 Government Accountability Office report found TSA had never assessed whether its screening practices produce higher referral rates for some passengers than others. The ACLU, the Council on American-Islamic Relations, and the National Center for Transgender Equality reported that advanced imaging technology frequently alarms on religious headwear, prostheses, and coarse hair, producing disproportionate pat-downs. GAO recommended TSA collect referral data and run compliance assessments, and DHS agreed to all four recommendations.20GAO. TSA Should Assess Potential for Discrimination and Improve Oversight of Screening
Cost-effectiveness has drawn its own criticism. A RAND Corporation report concluded the actual magnitude of terrorism risk to aviation “never has been well understood,” which makes it hard to measure the return on specific security spending. Security expert Bruce Schneier said TSA has failed to conduct proper cost-benefit analyses of its programs and questioned why a government agency should be exempt from a discipline private businesses routinely follow.21Reveal. Airport Security Costs Go Beyond TSA Budget, Report Says
What’s Changing Now
REAL ID and Facial Recognition
REAL ID enforcement took effect on May 7, 2025. Travelers at TSA checkpoints equipped with Credential Authentication Technology (CAT-2) systems must present a REAL ID-compliant identification document, a passport, or another accepted form of ID. The CAT-2 units themselves take a real-time photo of the traveler and compare it to the image on the physical ID. Testing began in August 2020 at Reagan National.22TSA. Biometrics Technology As of May 2025, more than 2,170 CAT-2 units were deployed at 262 airports, with a long-term target of 3,585.23DHS. TSA Capital Investment Plan FY 2026-2030 A separate Touchless ID program for PreCheck members uses facial comparison to verify identity without a physical document and is slated for 65 airports by spring 2026.24TSA. TSA PreCheck Touchless ID TSA says participation is voluntary and photos are deleted within 24 hours of the scheduled flight, or immediately after verification under normal operations.
The rollout is not settled law. No federal statute specifically governs facial recognition at airports, and multiple bills introduced since 2019 to pause or restrict the technology have not passed. Independent research has found facial recognition can misidentify women and people of color at higher rates, and TSA has not published performance data broken out by race, gender, or age. Critics have questioned whether the opt-out is meaningfully voluntary, citing reports that passengers often get little or no notice of the ability to decline.25The Regulatory Review. TSA Facial Recognition Raises Traveler Rights Concerns
Privatization Debates
Twenty airports currently participate in the Screening Partnership Program, which lets them use private screeners who must follow the same federal standards, training, and procedures.26TSA. Screening Partnership Program Supporters point to shorter reported wait times and continued operation during government shutdowns, since private contractors keep paying employees.27CNN. Airports Without TSA The American Federation of Government Employees and other critics argue privatization pushes profits ahead of safety and depresses screener wages.
In 2025 and 2026, the Trump administration proposed requiring hundreds of small airports to join the SPP and introduced a new concept called “TSA Gold+.” Unlike current SPP arrangements, where TSA supplies equipment and contractors supply staff, Gold+ would shift both to private contractors, with TSA setting standards and overseeing them.28NPR. TSA Gold Private Security Screening at Airports The administration’s FY 2027 budget projected roughly $52 million in savings and would cut about 4,500 TSA positions.29Government Executive. TSA Workforce and Privatized Airport Screening Airport interest in Gold+ has been limited so far, and acting administrator Ha Nguyen McNeill told Congress a legislative proposal was still being developed.30Federal News Network. TSA Advances GoldPlus Privatization Plan
The Union Fight
TSA screeners are not covered by Title 5 of the U.S. Code, the statute that governs most federal employees, and for years had no collective bargaining rights. In 2003, Secretary James Loy formally denied them the right to bargain. That changed in 2011 when Administrator John Pistole established a bargaining framework and screeners chose AFGE as their representative. The first binding contract was signed in November 2012, with follow-ons in 2016 and 2020.31NTEU. Order Denying Motion to Dismiss – AFGE v. Noem A seven-year contract signed in May 2024 under Administrator David Pekoske covered roughly 47,000 screeners and added just-cause discipline protections and a binding grievance process.32Federal News Network. DHS Moves to Eliminate TSA Collective Bargaining Agreement Again
In September 2025, DHS Secretary Kristi Noem issued a determination eliminating collective bargaining at TSA, citing incompatibility with the agency’s national security mission. TSA announced a new labor framework effective January 11, 2026, that rescinded the 2024 contract and prohibited screeners from bargaining or being represented by a union.33TSA. TSA Announces New Labor Framework AFGE sued in federal court in Washington State. In June 2025, Judge Marsha Pechman issued a preliminary injunction against the earlier version of the rescission, writing that it appeared to be “undertaken to punish AFGE and its members.” The court denied the government’s motion to dismiss in August 2025, letting the case proceed on Administrative Procedure Act, First Amendment, and Fifth Amendment claims.34Civil Rights Litigation Clearinghouse. AFGE v. Noem Trial is scheduled for September 2026.32Federal News Network. DHS Moves to Eliminate TSA Collective Bargaining Agreement Again
TSA screened more than 904 million passengers in 2024, an average of 2.4 million a day and a 5 percent increase over 2023, and projected nearly 83 million during the 2025 summer travel season alone, with volume expected to grow around 2.8 percent a year.23DHS. TSA Capital Investment Plan FY 2026-2030 The agency created under emergency conditions in late 2001 is now a permanent piece of American travel, and the shape of the checkpoint 25 years on still reflects the sequence of attacks, plots, and court decisions that built it.