London Heathrow Airport has introduced a sweeping change to its passenger screening process after completing the installation of next-generation CT security scanners across all terminals. The upgrade, which became fully operational this week (January 23, 2026) at a cost of $1.4 billion (£1 billion), allows travelers to pass through security without removing liquids or large electronics from their hand luggage. Implemented at the UK’s busiest airport, the move is designed to reduce congestion and modernize one of the most time-consuming stages of the airport journey. Heathrow officials say the new system will significantly improve passenger flow during peak travel periods.

For nearly two decades, passengers have been required to limit liquids to 100 ml containers and unpack laptops during security checks, rules introduced after security threats in the mid-2000s. While effective, those measures often slowed screening lines and created bottlenecks at major hubs. Heathrow’s upgrade reflects a broader shift toward smarter, data-driven security solutions that reduce manual intervention. Passengers should note, however, that screening rules may still vary at other airports worldwide.

How Heathrow’s New Security Technology Changes The Passenger Experience

The newly deployed CT scanners generate detailed three-dimensional images of cabin baggage, allowing security officers to identify potential threats without requiring passengers to unpack items. As a result, liquids and electronic devices can remain inside carry-on bags throughout screening. Similar systems are being introduced elsewhere, but most airports have yet to reach this level of implementation.

By removing the need for bag preparation at security, Heathrow expects a noticeable increase in screening throughput, particularly during morning and evening rush periods. Airport officials also point to a reduction in plastic waste, as liquid bags are no longer required. While the changes apply across Heathrow’s terminals, travelers are advised to confirm requirements for return journeys or connecting airports. The upgrade forms part of a wider strategy to improve operational resilience and passenger satisfaction. Heathrow CEO Thomas Woldbye said:

“Every Heathrow passenger can now leave their liquids and laptops in their bags at security as we become the largest airport in the world to roll out the latest security scanning technology. That means less time preparing for security and more time enjoying their journey – and millions fewer single-use plastic bags. This billion pound investment means our customers can be confident they will continue to have a great experience at Heathrow. »

Helping Continue Heathrow’s Performance Improvements

Security rules introduced in 2006 reshaped global aviation, strengthening risk mitigation but adding significant complexity to airport screening processes. As passenger volumes increased, especially at major hubs like Heathrow, the limitations of manual bag preparation and inspection became more apparent. The introduction of CT technology directly addresses these constraints by producing more detailed images of cabin baggage and automating threat detection. This allows passengers to move through checkpoints faster, reducing preparation time and easing pressure on security lanes during peak travel periods.

Airports across the world are now transitioning toward similar screening systems as travel demand continues to recover. Heathrow’s full-scale deployment positions the airport as a reference point for other large hubs weighing comparable investments. More efficient security screening has knock-on effects beyond the checkpoint, supporting stronger on-time performance and relieving congestion across terminal infrastructure. Heathrow estimates the change will also eliminate the need for nearly 16 million single-use plastic bags each year, delivering a notable environmental benefit.

The rollout follows several years of planning, regulatory clearance, and pandemic-related delays, with Heathrow’s size and operational complexity making the project particularly challenging. The transformation forms part of the airport’s long-term investment program aimed at supporting future growth and higher capacity while improving reliability. In 2025, Heathrow was named Europe’s most punctual hub airport, with more than 97% of passengers clearing security in under five minutes. Baggage performance also improved to a load rate exceeding 98%, placing an additional quarter of a million bags on their intended flights compared with the previous year, contributing to smoother journeys for both passengers and airlines.

What This Upgrade Means For Heathrow’s Terminals And Turnaround Times

The security upgrade is one element of Heathrow’s wider infrastructure investment program, which includes terminal improvements and upgraded baggage systems. Airport management has set internal targets to significantly shorten average security wait times. These initiatives are aimed at strengthening Heathrow’s competitiveness as global travel demand continues to rise. Additional technology deployments are expected over the coming years.

Heathrow has faced operational challenges in recent years, including weather disruptions and infrastructure incidents, which have highlighted the need for greater resilience. Recent performance data, however, suggests improvements in punctuality and baggage handling. Airport leadership says continued investment is essential to supporting long-term growth. Future upgrades will focus on capacity, sustainability, and passenger experience.

Despite the relaxed rules on liquids and electronics, standard restrictions on prohibited items remain in place. Passengers should continue to follow airline and airport guidance when packing carry-on bags. Heathrow says the new system strikes a balance between robust security and a more seamless journey through the airport.