Published by Global Banking & Finance Review®
Posted on July 30, 2025
2 min readLast updated: January 22, 2026
Add as preferred source on GoogleUK airports faced disruptions due to a radar fault in air traffic control, affecting flights for hours. NATS resolved the issue, and operations are resuming.
LONDON (Reuters) -A radar-related technical issue in Britain's air traffic control system disrupted flights for over four hours at major airports in London and elsewhere on Wednesday, though the issue was later resolved and departures were resuming.
"Our systems are fully operational and air traffic capacity is returning to normal," NATS, the country's air traffic control provider, said in a post on X.
"Departures at all airports have resumed and we are working with affected airlines and airports to clear the backlog safely. We apologise to everyone affected by this issue."
In a later update to Reuters, a NATS spokesperson said it was a radar-related issue, "which was resolved by quickly switching to the back up system during which time we reduced traffic to ensure safety."
The outage, announced by NATS 20 minutes earlier, included Heathrow Airport, Britain's largest and Europe's busiest.
"Flights at Heathrow have resumed following a technical issue at the NATS Swanwick air traffic control centre. We are advising passengers to check with their airline before travelling," an airport spokesperson said.
Gatwick Airport and Edinburgh Airport also said operations were resuming.
London City Airport had earlier also reported disruption. It was not clear exactly how long the outage had lasted.
Ryanair said the disruption lasted for "over four hours" and caused delays and several diversions, inconveniencing thousands of passengers.
The Irish low-budget airline said the problem was "utterly unacceptable" and called for Martin Rolfe, the chief executive of the air traffic control provider, to resign.
"It is clear that no lessons have been learnt since the Aug '23 NATS system outage and passengers continue to suffer as a result of Martin Rolfe’s incompetence," Ryanair chief operating officer Neal McMahon said in a statement.
In August 2023, flights across Britain were disrupted after the automatic processing of flight plans malfunctioned.
Last year, Britain's aviation regulator said NATS needed to review its contingency plans for outages after the disruption, which airline bosses said cost them over 100 million pounds ($133 million) in refunds and compensation.
($1 = 0.7534 pounds)
(Reporting by Sam Tabahriti and David Milliken in London, additional reporting by Conor Humphries in Dublin; writing by Alistair Smout; editing by William James, Philippa Fletcher and Mark Heinrich)
The disruption was caused by a radar-related technical issue in Britain's air traffic control system, which affected flights for over four hours.
The disruption affected major airports including Heathrow, Gatwick, and Edinburgh, with operations resuming later in the day.
Ryanair described the disruption as 'utterly unacceptable' and called for the resignation of NATS chief executive Martin Rolfe, citing a lack of lessons learned from a previous outage.
During the outage, NATS switched to a backup system and reduced traffic to ensure safety while resolving the issue.
The August 2023 outage cost airlines over 100 million pounds ($133 million) due to disruptions in flight operations across Britain.
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