Why are there holiday delay warnings over the EU's new border system?

The EU's new digital border system, which requires fingerprints and photos alongside a passport scan, became fully operational on 10 April.

The Entry/Exit System or EES will eventually be active at every border crossing in 29 participating countries.

There have been long queues at some European airports and warnings that delays could be worse during busy holiday periods.

EES is a digital system designed to keep track of non-EU citizens - including those from the UK - entering and leaving the Schengen Area.

This covers 29 European countries , external- mainly in the EU - which people can travel across without border controls.

It includes many popular destinations for UK travellers, such as France, Spain, Portugal, Italy and Greece.

Under the new system, fingerprints and a photo have to be registered.

EES will eventually replace the current system of passports being stamped by a border officer.

The gradual introduction of EES began on 12 October, and the plan was to phase it in over six months.

However, due to some hiccups, not every point was fully rolled out by the April deadline.

There have already been hours-long queues at pinch points.

On 12 April, about 100 passengers were stranded in Milan when their easyJet flight to Manchester left without them. They faced queues up to three hours at the airport because of the new system. The airline said the situation was "outside of our control".

Travellers arriving at popular ski destination Geneva also experienced long delays due to the system in early 2026.

Travel experts have told BBC News that the system has been affected by IT issues, and long queues can form where travellers are unable to use the system with ease.

The European Commission has indicated that temporarily suspending EES checks will be allowed at busy times until September.

The first time they use the new system, people from most non-EU countries will have to register biometric information while having their passport scanned.

Flight passengers will register at their destination airport.

But if you are crossing the English Channel by ferry from the port of Dover, taking the Eurotunnel shuttle to France, or getting the Eurostar train, it will be done as you leave the UK.

At these places, most passengers will have to follow the instructions at special kiosks.

The machines will scan each passport, then take fingerprints and a photo.

Children under 12 won't have to provide fingerprints. Staff should be on hand to help.

The screen will also present travellers with four questions about their trip, such as confirming where they will be staying and that they have enough money.

However, at Eurotunnel, those questions will be asked by border officers, on a discretionary basis.

The EES registration will be valid for three years, with the details verified on each trip during that period.

At Dover, ferry passengers in coaches started using the new system in October. Other tourist traffic was initially meant to follow on 1 November.

However, people in cars have still not begun using it, with no date yet confirmed.

Eurotunnel, which runs vehicle shuttles through the Channel Tunnel, is also introducing the EES in stages.

At the port of Dover and Eurostar's London St Pancras terminal, which did not switch on the system on 10 April, the questions will also not be presented on the machines during the introductory period.

Big changes have had to be made at Dover. The port has reclaimed some land from the sea to create an additional processing area.

People will head to this new area, a mile from the ferry terminal, to do their EES checks.

Because the French border has in effect been moved to a coach processing building in this new area, coaches will be sealed after passengers have completed their checks. They will then drive over to catch their ferry.

The port's boss says groups of schoolchildren will be able to do some of their registration in advance, so they will only need to present their passports at the border.

Eurostar has installed 49 EES kiosks in three areas around its London St Pancras terminal. Passengers will use them before presenting their ticket at the departures area.

However, checks are currently being completed manually by border officers, not at the machines. Eurostar says it will bring in the kiosks "once the operational software and the activation timetable are confirmed and approved by the French Ministry of Interior".

Eurotunnel has installed more than a hundred kiosks at each side of the Channel.

Customers who are travelling in cars will be directed to drive up to a kiosk bearing their registration number, and provide their biometric information there. Coach passengers will go through the process with a border officer.

A mobile phone app has been developed to enable passengers to do part of the process before reaching the border. However, this isn't being widely used at the moment.

Concerns have repeatedly been raised that the extra couple of minutes it takes for each traveller to complete the registration process could lead to big queues, particularly at space-constrained Dover.

However, bosses at cross-Channel travel hubs hope that the decision to introduce EES gradually, instead of with a "big bang" start, will reduce the risk of disruption.

Eurotunnel chief executive Yann Leriche said there will be no "chaos" or queues at the Channel tunnel and that his company is fully prepared.

Similarly, Eurostar hopes its decision to limit EES initially to some business travellers before expanding its use will help prevent queues.

The EU is also introducing a new visa waiver system linked to passports called the European Travel Information and Authorisation System (ETIAS), which will build on the EES.

Citizens of non-EU countries who don't need a visa to enter the EU - including people from the UK - will be able to apply online for authorisation before they travel.

ETIAS isn't due to start until the end of 2026, but the final date has not yet been confirmed.

It will cost €20 (£17.47) per application, and will be valid for three years.

People aged under 18 and over 70 will need to apply, but won't have to pay.

Additional reporting from Kris Bramwell.