A cyber-related incident involving Collins Aerospace disrupted airline check-in systems at major European airports, including Heathrow, Brussels, and Berlin, leading to hundreds of flight delays. As of Sunday morning, more than 130 flights at Heathrow had been delayed by at least 20 minutes, with 13 cancellations reported on Saturday. The incident forced airlines to revert to manual check-in processes, causing significant inconvenience for travelers. Heathrow's social media account acknowledged the issue and apologized for the delays, urging passengers to arrive at least three hours before long-haul flights and two hours for short-haul flights. The situation highlights vulnerabilities in airport technology and the impact of cyberattacks on transportation.