Air traffic control glitch delays flights at Heathrow, UK airports

A technical issue at the UK's air traffic control center in Swanwick is causing delays to hundreds of flights Saturday across the United Kingdom, including Heathrow Airport.

"We are currently experiencing some difficulty switching from night time to daytime operation," National Air Traffic Services (NATS) said in a statement.

"This may result in some delays for which we apologise. Engineers are working to rectify the problem as soon as possible."