Britain's National Air Traffic Service (NATS) was forced to restrict the flow of aircraft on Monday as it works to address a technical issue, it said, with airlines and airports warning of delays and cancellations.
"We are currently experiencing a technical issue and have applied traffic flow restrictions to maintain safety. Engineers are working to find and fix the fault," a spokesperson said, adding that UK airspace was not closed.
Earlier Scottish airline Loganair said on social media site X, previously known as Twitter, that there had been a network-wide failure of UK air traffic control computer systems, warning international flights may face delays.
Airports including London Luton and Birmingham said they were working to understand the impact and the timescale in which normal operations could resume, while British Airways also said it was working closely with NATS to understand the impact.
Dublin Airport said the air traffic control issues were resulting in delays and cancellations to some flights into and out of the Irish capital and advised passengers due to travel today to check the status of their flight with their airline in advance.
Several passengers took to social media to say they were stuck on planes on the tarmac waiting to take off on what is a busy travel day due to Monday's public holiday in parts of Britain.
One Reuters witness being held on the tarmac at Budapest said their pilot told passengers that they faced an 8-12 hour delay.
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