Update: Air traffic control manager National Air Traffic Services said that it has "identified and remedied the technical issue affecting our flight planning system this morning. We are now working closely with airlines and airports to manage the flights affected as efficiently as possible.

"Our engineers will be carefully monitoring the system’s performance as we return to normal operations."

Flights are still impacted as service slowly returns.

Original story: A network-wide outage impacting air traffic control systems in the UK is leading to flight delays across the country.

The scale of the problem, and how many flights are impacted, is not yet known.

"There has been a network-wide failure of UK air traffic control computer systems this morning," British airline Loganair said on X/Twitter.

“Although we are hopeful of being able to operate most intra-Scotland flights on the basis of local coordination 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.”

The National Air Traffic Services (NATS), which provides air traffic control services in the UK, 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 apologize for any inconvenience this may cause.”

The issue comes on a Bank Holiday, a national holiday in the country, where the number of flights is expected to be higher.

In May, during another extended bank holiday weekend break, electronic passport gates across UK airports went down, also causing chaos at Heathrow, Gatwick, and Manchester airports.

That issue came just days after a British Airways IT systems failure at Heathrow, which led to the cancelation of 175 flights and impacted more than 20,000 passengers.