The Smart Marty Sky Dispatch
What The TSA Liquids Rule Really Means At US Checkpoints In 2026
Even as the TSA changes, the 3-1-1 rule stays the same (for now).
The TSA continues its longstanding restriction on liquids, aerosols, and gels at US security checkpoints, commonly referred to as the 3-1-1 rule. The rule governs what travelers may carry in their carry-on bags and remains in effect as part of security screening procedures.
The policy’s origin traces back to August 2006, when the TSA implemented the liquids rule. At the time, legacy X-ray machines could not reliably distinguish between harmless liquids and volatile liquid explosive components, prompting the requirement.
The article excerpt focuses on the rationale behind the rule rather than detailing current enforcement changes or procedural updates. It notes that the restriction was a response to security screening limitations rather than an arbitrary measure.
No additional specifics are provided about recent amendments, traveler impacts, or operational changes at particular airports. The material emphasizes the historical motivation for the policy rather than presenting new outcomes or incident data.
The source is a Simple Flying article with input from Luke Diaz, described as a freelance military writer with Navy experience, but no direct quotes or additional details are included in the supplied material.