Close Major air traffic control outage grounds flights across the UKSign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy noticeA radar systems failure caused the air traffic outage on Wednesday, officials have said, as flight delay chaos could continue for days. The “glitch” left air traffic controllers with a patchy picture of the airspace as software that is supposed to relay information to their screens broke down. Sources said safety restrictions were “immediately” put in place by bosses at the National Air Traffic Service (Nats), which is in charge of UK airspace. Have you been affected by the air traffic control shutdown?