Operations at major European airports were disrupted over the weekend after a ransomware attack targeted Collins Aerospace’s Muse check-in and boarding platform. Airports affected include Heathrow, Brussels, Berlin, and Dublin.

The incident began on Friday, forcing airports to revert to manual check-in procedures. The resulting delays led to significant flight cancellations and extended queues. Brussels Airport alone canceled nearly half of its planned departures on Monday due to ongoing technical and security complications.

The European Union Agency for Cybersecurity (ENISA) confirmed that a ransomware attack by a third party was behind the disruptions. Law enforcement agencies are actively investigating the incident.

The cyberattack had an immediate effect on airline share prices. Shares of Lufthansa (TG:LHA), International Consolidated Airlines Group (LSE:IAG), Air France (EU:AF), EasyJet (LSE:EZJ), Wizz Air (LSE:WIZZ), Ryanair (LSE:0RYA), and TUI (TG:TUI1) fell between 0.5% and 1.3% as of 08:53 GMT.

Airports indicated that online and self-service check-in options were still functioning, but manual processing extended wait times. Authorities advised travelers to check flight statuses and use alternative check-in methods whenever possible.

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