The disruptions over the weekend at several major European airports were caused by a ransomware attack targeting the check-in and boarding systems. “Following a cyberattack on the American company Collins Aerospace, the external provider of check-in and boarding systems, there are disruptions to check-in operations at several European airports,” Brussels Airport says on its website. Ransomware attack confirmedThe European Union Agency for Cybersecurity (ENISA) told The Guardian in a statement on Monday that a ransomware attack caused the disruptions. Brussels Airport said that disruptions continued on Monday and advised passengers to check the status of their flight before coming to the airport. Collins Aerospace has been working to restore the system as soon as possible at impacted airports.