British airspace has been hit by a technical fault, the country’s leading provider of air traffic control services said.
The PA news agency understands passengers boarding flights back to Britain have been told of the fault.
National Air Traffic Services (NATS) said it was experiencing a “technical issue” and had applied traffic flow restrictions to maintain safety.
It said in a statement: “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. We apologise for any inconvenience this may cause.”
Meanwhile, airline Loganair warned customers that they might experience delays as a network-wide failure affected air-traffic control systems on Monday morning.
The Glasgow-based airline posted on X (formerly Twitter): “There has been a network-wide failure of UK air traffic control computer systems this morning.
“Although we are hopeful of being able to operate most intra-Scotland flights on the basis of local co-ordination and with a minimum of disruption, north-south and international flights may be subject to delays.
“If you are flying with us today, please check our website for the latest information about your flight before setting off for the airport.”