Why does Britain face flight chaos during bad weather?

"Aircraft can operate safely in fog, but airports go into a kind of slow motion," says travel expert Simon Calder. "Aircraft follow a beam from the instrument landing system. This beam must not be broken, which could happen when it's foggy," he tells the BBC. And when there are high winds, for safety, aircraft have to be more spaced apart than usual. Despite Heathrow trialling artificial intelligence to help planes land in low visibility, controllers in on-ground towers still need to clearly see an aircraft arriving before issuing a landing clearance, aviation expert Scott Bateman MBE wrote on X.