A “technical problem” at an air traffic control centre is causing delays at airports across the UK.
At Leeds Bradford Airport, early morning flights to Lanzarote and Malaga are believed to have been affected.
National Air Traffic Services (Nats) said the issue stemmed from its control centre in Swanwick, Hampshire.
A spokesman said: “Due to a technical problem at Swanwick, we are currently experiencing some difficulty switching from night-time to daytime operation. This may result in some delays, for which we apologise.
“Engineers are working to rectify the problem as soon as possible.”
Passengers are advised to check with their airline for the latest situation.