Published by Global Banking & Finance Review®
Posted on July 31, 2025
2 min readLast updated: January 22, 2026
Add as preferred source on GoogleA technical issue disrupted UK air travel, affecting over 100 flights. No malicious activity was found, and flights resumed as systems were restored.
LONDON (Reuters) -A technical problem that affected over a hundred flights across UK airports on Wednesday was an isolated event with no evidence of malign activity, transport minister Heidi Alexander said, as airlines worked to clear the backlog on Thursday.
National Air Traffic Services (NATS) restored its systems, with capacity returning to normal, late on Wednesday after switching to a back-up system following what it described as a radar-related failure.
The second outage in recent years at NATS, which provides air traffic control services for planes in UK airspace and the eastern part of the North Atlantic, affected Heathrow and Gatwick airports in London, Edinburgh Airport, and other locations.
On Thursday, NATS repeated its apology to those affected, and added that there was no evidence that the incident was cyber-related.
"I know that any disruption is frustrating for passengers. Flights are now resumed ... I will continue to receive regular updates," Alexander wrote on social media platform X, following a meeting with NATS Chief Executive Martin Rolfe over the incident.
Earlier on Thursday, Alexander said NATS was working closely with airlines and airports to clear the backlog.
A total of 122 flights were cancelled as of 1830 GMT on Wednesday, with a further 23 cancelled as of 0730 GMT on Thursday, according to aviation analytics firm Cirium.
At least 16 flights, including departures to Brussels and Toronto and arrivals from New York and Berlin, had been cancelled at Heathrow Airport, according to its website.
The airport, Britain's largest and Europe's busiest, was hit by a fire at a power sub-station in March which stranded thousands of passengers.
Ryanair Chief Operating Officer Neal McMahon called on NATS' Rolfe to resign, saying no lessons had been learnt since the August 2023 disruption caused by a malfunctioning in the automatic processing of flight plans.
(Reporting by Muvija M; Additional reporting by Sam TabahritiEditing by William Schomberg, Catarina Demony and Giles Elgood)
The disruption was caused by a technical problem at the National Air Traffic Services (NATS), which affected over a hundred flights.
Transport minister Heidi Alexander stated there was no evidence of malign activity related to the disruption.
A total of 122 flights were cancelled as of 1830 GMT on Wednesday, with an additional 23 cancellations reported by Thursday morning.
NATS switched to a back-up system to restore its operations and worked closely with airlines and airports to clear the backlog of affected flights.
The current outage is the second in recent years for NATS, following a disruption caused by a malfunctioning automatic processing system in August 2023.
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