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SSSS is a code used by TSA security agents in the USA to identify a passenger who may pose a potential threat. The code is added to their boarding pass to make security staff aware and these passengers will encounter a more indepth search of both their person and their baggage.

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Sniffer dogs- like this black Labrador- are used at various locations throughout an airport. They may be used in the baggage reclaim area to sniff for illegal drugs. They are also deployed in the security area to sniff for any potential explosives.

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These are the shoes worn by Richard Reid who tried to blow up an aircraft in 2001. Reid- who is also known as the "shoe bomber" had explosives built into his shoes. He tried to detonate the explosives during the flight, but luckily it didn't work. This is the reason why passengers are asked to remove their shoes and boots whilst going through airport security.

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All airports will have a perimeter fence to protect them. Many of these fences will be topped by barbed wire and most fences will also have CCTV cameras positioned strategically along this fence. However, during the London Gatwick drone attack in December 2018, these fences proved worthless as the drones simply flew over them.

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If, when walking through the metal detector, the alarm is sounded, then a security officer will give the passenger what is known as a "pat-down". This is when they check they are not carrying anything on their person which may endanger others on the flight. Generally speaking, a female passenger will be patted down by a female security officer.

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Passports are another form of airport security as it allows immigration officers to know who is entering the country and they can refuse entry to any passenger who does not have the correct documentation.

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This is a metal detector which all passengers- including children and infants- must walk through before they are airside. These metal detectors are there to identify anyone carrying anything that could be used to harm passengers and crew whilst in the air such as a gun or a knife.

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Pam Am Flight 103, which was blown apart in the skies over Lockerbie on December 21st 1998. A bomb had been put on the plane in Frankfurt and the intention was that it would explode whilst the plane was over the Atlantic Ocean. However, the flight was delayed leaving London Heathrow- where it transited- and instead exploded over the town of Lockerbie in the Scottish Borders. All passengers and crew on-board were killed as well as 11 residents of the town. This incident resulted in a huge number of changes to airport security. In particular, unaccompanied bags could no longer travel without a passenger.

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Many people query why you can't take liquids through to the airside area of an airport. The fact is, a terrorist bomb threat was identified which involved explosives carried in liquid. So, no liquid can be carried airside in case it contains explosives.

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This is the terrorist attack that took place at Glasgow Airport on June 30th, 2007- the first weekend of the Scottish school holidays and the airport was very busy. The terrorists tried to drive their car- which was packed with explosives- into the terminal building. The car crashed whilst trying to enter the terminal and the terrorists were detained by some very brave members of the public.

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This is a full body scanner that is found at many UK airports now. This scanner can see if a passenger has anything concealed on his body. They were introduced to help alleviate the threat posed by terrorists such as Al-Qaeda who would have explosives internally. An image is taken of a passenger who is getting the full body scan. However, this image is not kept if the passenger is clear.

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Many UK airports now have these gates at airport security. They have bar code readers built in, so passengers can scan the bar code on their boarding pass to be allowed entry to the airside area of the airport. This is a security measure as only passengers with boarding passes and staff with a valid ID will be able to access these gates.

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This is UK Customs. We used to have three channels- red (nothing to declare), green (goods to declare) and blue (duty-paid and arrivals from within the EU). However, in the UK we have now left the EU, so there are now only two customs channels- red and green.

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At the check-in desk, this sign is displayed. It is also displayed when you check-in online. It lists all of the dangerous goods that CANNOT be taken on-board. The reason it is shown at check-in is to allow passengers to remove these goods from their baggage before check-in.

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Security begins at the very start of your journey where you are asked three security questions at check-in relating to your baggage.

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This is a box cutter and it was carried by one of the 9/11 hijackers

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Barriers are commonly found in front of terminal buildings in the UK in the aftermath of the terrorist attack on Glasgow Airport where terrorists drove into the main terminal building in a vehicle laden with explosives.

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Baggage reclaim which is always airside at an airport for security reasons. Passengers will encounter baggage reclaim after Immigration and before Customs.

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An example of an airside pass that anyone working at an airport is required to have to allow them to move from landside to airside through airport security.

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E.gates at immigration. Only passengers with a chip on their passport can use these gates.

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Queues at airport security in a US airport 

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9/11 when hijacked planes hit the World Trade Centre in New York