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Airport security liquids rule – what is changing?

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Many airline passengers say the worst part of any journey is the airport security check. Worldwide in normal times, half a million people pass through airport security every hour. Travellers resent the limit on LAGs (liquids, aerosols and gels) in cabin baggage, as well as the obligation to extract electronics such as laptops and tablets from hand luggage.

The liquids rules were introduced hastily in 2006 as “a temporary measure” to protect against explosives. Despite repeated promises they remain in place.

In 2019 Boris Johnson vowed the rules would be eased at major UK airports by 2022, allowing larger quantities and eliminating the need to have liquids separately scanned. Rishi Sunak’s government then extended that deadline to June 2024.

New scanners are being installed at checkpoints at all the UK’s main airports – but not fast enough to meet the June deadline. The biggest UK hubs say they will not be ready in time. The transport secretary, Mark Harper, has given airports an extension, but warned that they could be fined if they further delay the roll-out of smoother security.

Simon Calder, former security officer at Gatwick airport and current Independent travel correspondent, explains more.

Cabin baggage: what are the rules?

The list of items that cannot be taken through an airport security checkpoints in carry-on bags has increased over the decades, evolving in reaction to terrorist attacks – successful and otherwise.

All weapons, whether firearms, knives or explosives, are banned from hand luggage. But there are also strict rules about larger quantities of liquids, aerosols, gels, pastes, lotions and cosmetics, extending even to yoghurt, soft cheese and Creme Eggs.

No container for any LAG can be above 100ml, and they must be carried within a resealable clear plastic bag with a maximum volume of one litre.

How did the liquids rule come about?

In August 2006 the aviation industry – and baffled passengers – awoke to find security rules for passengers had tightened overnight. The government announced that it had uncovered a terror plot to blow up transatlantic jets from Heathrow to North America.

The perpetrators aimed to take the ingredients for improvised explosive devices on board a number of aircraft. The ingredients, derived from hydrogen peroxide, were intended to be disguised in soft drink containers. The plotters aimed to assemble the bombs on board before detonating them and destroying the plane. They were later convicted of offences including conspiracy to murder and conspiracy to cause explosions.

The bosses of Britain’s airlines were called in the early hours of 10 August 2006 to be told their passengers would be banned from carrying anything more than a purse or wallet into an aircraft cabin. Even pens were banned from transatlantic flights, on the grounds that the ink they contained was a liquid.

One concession was made, for nursing mothers: they could take milk for their baby through the checkpoint, but only if they tasted it first in front of security staff to demonstrate it was the real thing.

Baggage systems could not cope with two or three times the normal number of items, and Heathrow airport ground almost to a standstill. Flight networks elsewhere in the UK and Europe were also affected.

Three months later, the rules were eased – but with strict limits that prevail today at almost all UK and overseas airports. The limits were introduced as a “temporary measure” while airport security technology caught up. But progress has been painfully slow.

Even a very modest relaxation of the rules – to allow airport purchases of drinks to be taken through checkpoints in a sealed “security tamper-evident bag” (Steb) – took years to be implemented.

Many passengers are still being caught out, losing their expensive airport purchases, because duty-free drinks are not allowed through the airport where they change planes.

Is there a technological solution?

Yes. Modern scanners use computed tomography (CT) – the same technology as medical scanners – to analyse the molecular structure of the contents of a passenger’s bag. The nachines can detect any potential threat and present security officers with a three-dimensional image of the contents.

They can also analyse whether laptops and other electronic equipment present a danger.

At airports where the technology is used, liquids and laptops no longer have to be removed. The kit was first used in Europe at Shannon in the west of Ireland, where “liquids, gels, pastes, lotions and cosmetics in containers of any size” have been allowed through security since March 2022.

Teesside airport and London City airport are also now fully updated.

Travellers have a much easier experience: they no longer need deconstruct their cabin bags, and the whole airport process feels much easier.

Security is also enhanced, with more sophisticated assessment of potential threats. The amount of staff time consumed in “secondary searches” is reduced, allowing officers to spend more time assessing passenger behaviour.

To reduce stress for passengers and increase security, in 2019 the government told all major UK airports to have advanced CT scanners at security checkpoints by 1 December 2022. But the deadline was missed.

During the Covid pandemic, airports faced catastrophic losses as passenger numbers collapsed. The obligation to make the multi-million pound investment required was lifted.

But smoother journeys are now back on the table?

Yes. In 2022, the transport secretary Mark Harper said the airport experience would become easier from June 2024: “The tiny toiletry has become a staple of airport security checkpoints, but that’s all set to change. I’m streamlining cabin bag rules at airports while enhancing security.

“By 2024, major airports across the UK will have the latest security tech installed, reducing queuing times, improving the passenger experience, and most importantly detecting potential threats.”

Some airports, including Luton and Birmingham, are on course to meet the June 2024 deadline. But the UK’s four biggest airports will not be ready.

  • A spokesperson for Heathrow airport told The Independent: “Heathrow has to replace 146 lanes, while some of the smaller airports have less than 10 to replace, this shows the magnitude of the work ongoing at Heathrow while we continue to ensure smooth security experiences for passengers.”
  • Gatwick expects to be fully ready in the first three months of 2025. A spokesperson for the Sussex airport said: “We currently plan to have completed the major logistical operation required to install the remaining scanners in Q1 2025, after the busy summer peak period has concluded.”
  • Manchester Airports Group, which owns Stansted and East Midlands as well as Manchester, will have the new scanners “in place on a large number of our security lanes by June 2024” – but the programme will not be completed until 2025.

When everyone is ready, will that be the end of problems?

Not necessarily: passenger confusion is a constant problem for aviation security. Nothing has changed yet, though some travellers may infer that it has.

Worldwide, lack of conformity is a key issue for aviation security professionals – and passengers.

At many airports liquids are limited but can stay in the traveller’s bag. Laptops and tablets such as iPads must be removed in the UK and many other countries, but in some nations they need not be.

In Israel, procedures are entirely different. The authorities say: “Passengers should arrive three hours prior to departure for the security check procedure.” There is sometimes intense questioning by officials, and laptops must be removed. But liquids are permitted without restriction.

The main issue: passengers should not expect aviation security to be the same worldwide – or even UK-wide. At some small Scottish airports including Barra, Campbeltown and Tiree there have been no security checks since 2017.

Is this going to cost me more?

The airports that are collectively investing hundreds of millions of pounds will be seeking a return – and that could include raising fees. But the new tech should cut staff costs, representing savings for airports.

Willie Walsh, director-general of the International Air Transport Association (Iata) – representing airlines worldwide – said: “Implementing this technology should not come with a big bill. In fact, simplified processes should deliver significant efficiencies.”

“Speedy deployment should be possible. The technology has already been used successfully and for a long time at various airports across the world with measurable improvements to the passenger experience.”

Will aviation security remain a permanent pain?

No. In 2019 Iata described the prevailing security situation as “no longer sustainable”. It has been working with airports for over a decade on a project called “Smart Security”.

Ultimately walk-through metal detectors and security pat-down of many passengers should be eliminated, with technology assessing possible threats more effectively than humans watching screens.

The passenger should be able to walk unchallenged along a corridor flanked by detectors, barely aware that they are being checked.

Checkpoints will still be staffed, but security personnel will be freed up to do what people do best, which is to study the behaviour of passengers and identify “persons of interest” for further investigation.

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