Travelers at major European airports including Heathrow, Brussels, and Berlin faced significant delays this weekend following what Collins Aerospace described as a “cyber-related incident.”

Collins Aerospace makes technology for airline check-in desks, so after the apparent cyberattack, airlines were forced to revert to manual check-ins, according to the Guardian . According to data from Flightradar24, more than 130 Heathrow flights had been delayed by 20 minutes or more as of 11am on Sunday morning, with 13 flights canceled on Saturday.

A post on the Heathrow social media account said, “Work continues to resolve and recover from Friday’s outage of a Collins Aerospace airline system that impacted check-in. We apologise to those who have faced delays, but by working together with airli

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