A cyberattack disrupted check-in systems at major European airports from Friday evening, September 19, 2025, to Sunday, September 21, 2025. The incident caused major delays and cancellations, with Brussels, Berlin, and London airports being the most affected. Brussels Airport suffered the greatest impact. Officials requested the cancellation of nearly 140 flights scheduled for Monday, September 22, because Collins Aerospace, the U.S. company responsible for the system, had not yet delivered a secure software update. The disruption began when airlines could not issue boarding passes, bag tags, or luggage tags electronically. As a result, carriers relied on manual systems, and Brussels Airport reported 25 canceled flights on Saturday, September 20, 2025, and 50 flights on Sunday, September 21, 2025, showing how serious the problem was.

The attack mainly targeted the check-in desks, but self-service kiosks, online check-in, and air traffic control remained operational. Airport staff used handwritten boarding passes and backup laptops, leading to long queues and waiting times for passengers. Experts suggested that hackers, criminal organizations, or state actors could be responsible, but no group has claimed the attack. The European Commission confirmed that aviation safety was not at risk. Collins Aerospace stated the issue was limited to passenger check-in and baggage services and promised a secure update. Analysts stressed that the incident highlights how strongly international travel depends on complex digital systems, which remain vulnerable to cyberattacks.