Twenty-five years after the Sept. 11, 2001, terror attacks, the U.S. Transportation Security Administration (TSA) has begun rolling back some of the most enduring airport security restrictions. Travelers are now permitted to keep their shoes on during screening, a change announced last year that took effect in 2026. The rule, introduced after the 2001 "shoe bomber" plot, had required passengers to remove footwear for nearly a quarter-century.
The shift marks the latest in a series of incremental adjustments to security protocols that were overhauled in the aftermath of the attacks. While the TSA has not altered liquid restrictions—stemming from a 2006 plot to use liquid explosives—the agency has deployed new scanning technology at select airports, allowing some travelers to leave liquids in their bags during screening. These changes reflect ongoing evaluations of security measures based on evolving threats and technological capabilities.
Airport security before 9/11
Before the attacks, airport security was significantly less stringent. Travelers could be accompanied by friends or family through security checkpoints without a boarding pass. Knives and blades under four inches were permitted in carry-on luggage, and private companies—not government-run agencies—handled screening. While metal detectors and X-ray machines existed, the process was far less intrusive than today’s standards.
The attacks prompted a near-instant transformation of aviation security. Within months, the U.S. government established the TSA under the Department of Homeland Security, which became responsible for all passenger screening. New measures included mandatory shoe removal, strict liquid limits, and the elimination of curbside check-ins and gate-side farewells. The TSA also implemented facial recognition, advanced baggage scanning, and enhanced passenger screenings, reshaping air travel into a highly regulated experience.
Ongoing adjustments and technological upgrades
The TSA has continued to refine its approach in response to new threats. The 2006 liquid explosives plot in the UK led to the current 3-1-1 rule—allowing liquids in containers of 3.4 ounces or less, packed in a single 1-quart bag. However, newer scanners at some airports now permit travelers to bypass the liquids rule by keeping items in their bags, though availability varies by location.
Jeff Price, a professor at Metropolitan State University of Denver and aviation security expert, noted that modern screening technologies are more advanced than those used decades ago. "The technologies today are better than they were a long time ago and some of the technology that's been deployed is better than it was five years ago," Price said. The TSA has also emphasized that security measures remain adaptable to emerging risks, including cyber threats and evolving terrorist tactics.
Long-term impact on travel culture
The post-9/11 security regime has fundamentally altered the passenger experience. Gone are the days of spontaneous gate-side goodbyes or unaccompanied visitors in secure areas. The shift has also influenced airline operations, with airlines adjusting boarding processes and terminal designs to accommodate security checkpoints. While some travelers welcome the easing of certain rules, others express concerns about potential vulnerabilities in the new protocols.
The TSA has not indicated plans to further relax shoe restrictions but continues to evaluate other measures. For now, the changes represent a rare reversal of a policy deeply tied to the 9/11 legacy, signaling a cautious step toward balancing security with convenience in air travel.