Over 120 flights disrupted by UK tech glitch
The number of aircraft in London's air space was limited by the service, known as NATS, as a result of a technical issue which was quickly resolved.
Airports including London's Heathrow and Gatwick and Edinburgh were affected. Heathrow is Europe's busiest air hub.
There were 67 departures and 55 arrivals cancelled as of 7.30 pm (1830 GMT) while a number of flights were also diverted, according to aviation analytics firm Cirium.
In 2023, NATS suffered the country's worst systems failure in almost 10 years, stranding thousands of passengers.
Airline chiefs reacted angrily to the cancellations which came at the peak of the UK summer holiday travel season.
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Ryanair COO Neal McMahon called for NATS's chief executive Martin Rolfe to resign over the failure.
'It is outrageous that passengers are once again being hit with delays and disruption,' said McMahon.
'It is clear that no lessons have been learnt since the August 2023 NATS system outage.'
EasyJet COO David Morgan said it was 'extremely disappointing' to again see a failure 'causing disruption to our customers at this busy and important time of year for travel'.
'While our priority today is supporting our customers, we will want to understand from NATS what steps they are taking to ensure issues don't continue,' he added.
A Department for Transport spokesperson said it was 'working closely' with NATS to understand the cause of the glitch and the 'implications for the resilience systems in place'.
The 'technical issue' responsible for the disruption was at the service's control centre in Swanwick in south-west England, it said.
It first announced problems at around 4.00 pm (1500 GMT) and in an update an hour later said systems were fully operational and that departures had resumed at all airports. AFP
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