Airlines warn of UK flight delays over air traffic control fault

A "technical issue" hit UK air traffic control systems, with thousands of people now facing flight delays.

Holidaymakers are stuck all over the UK and abroad, with the National Air Traffic Services (Nats) saying it had applied restrictions to traffic flow.

Passengers have been advised to check if their flight is affected on one of the biggest travel days of the year.

One told BBC News he could be waiting until the early hours for his delayed flight to return to the UK.

Nats apologised for the fault just after midday on Monday, before it announced at 15:15 BST it had identified and remedied the issue that was affecting its "ability to automatically process flight plans".

They added that engineers would be monitoring the system's performance as it returns to normal.

It had earlier stressed that "UK airspace is not closed, we have had to apply air traffic flow restrictions which ensures we can maintain safety".

Several airports across the UK, and airlines including Ryanair, EasyJet, Wizz Air, Loganair and Aer Lingus have all warned passengers of delays or cancellations to flights.

British Airways said it had to make "significant changes" to its schedule and advised passengers due to catch short-haul journey to check their flight's status as it "may no longer be operating".

Alastair Rosenschein, a former British Airways pilot and now an aviation consultant, called the disruption "huge" - and said the equivalent for cars would be if every road was closed in the country.

"It's a bit of a nightmare scenario, really," he told BBC Radio 5 Live.

Chris Wroe told BBC News he and his family are waiting at an airport in the Netherlands for his delayed British Airways flight back to London.

"On the app it's saying departure at 2am tomorrow," the father travelling with a one-year-old said. "Staff at check-in just said it's an indefinite delay."

Kim Rabbits is stuck on a plane on the tarmac in Lanzarote, and said passengers had been told the UK is not accepting any flights "so we don't know how long we're going to be here for".

"We're all boarded and the doors are locked, and we've been told we need to stay put in case we get a green light," she told Radio 5 Live.

BBC journalist Alex Murray said he was due to fly from Bari, Italy to the UK - but passengers have been told they could expect delays of around six hours.

"At the moment we're waiting to find out if we'll be disembarking until our departure time," he said.

The delays could potentially affect thousands of people. Cirium, an aviation data firm, said 3,049 flights were due to depart UK airports on Monday, and a further 3,054 flights were scheduled to arrive. It is not clear what time the problems began.

According to travel journalist Simon Calder, aircraft are coming down slowly, but that the "flow rate" - at which aircraft can land - has been significantly reduced.

He told BBC News that Bank Holiday Monday is one of the busiest days of the year, as many people return from long weekend trips abroad - pointing out that the UK's Heathrow Airport is the busiest two-runway airport in the world, while Gatwick is the world's busiest single runway airport.

There is "no certainty about when it is going to be fixed" he said, adding that officials appear to "not know at this stage what caused the problem nor indeed how to fix it".

"I fear there are going to be an awful lot of people waking up tomorrow where they don't want to be," he said.

Ryanair said it will be "forced to delay/cancel a number of flights", while Wizz Air also said there could be "heavy delays and possible cancellations".

British Airways said it was working with NATS to "understand the impact" of the issue, and said it will keep customers updated, while Aer Lingus urged passengers to check their flight status before going to the airport as "delays and cancellations are likely".

Spokespeople for London Luton, Stansted, Heathrow and Gatwick airports all said they were experiencing issues, and urged customers to contact their airlines. Liverpool John Lennon Airport said "some flights might be subject to a delay", while Edinburgh Airport urged passengers to check with their airline before going to the airport.

Transport Secretary Mark Harper advised "passengers should contact their airline for up-to-date flight information".

The Liberal Democrats had called on the prime minister to convene emergency response committee Cobra, while Labour said the incident was "extremely concerning".

Irish minister of state for transport Jack Chambers warned of a "major" knock-on impact on flights to and from Ireland as a consequence of the issues in the UK.

The air traffic control issues in the UK are "resulting in delays and cancellations to some flights into and out of Dublin Airport," the airport told BBC News in a statement.

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