A cyberattack is causing major delays and some flight cancellations at European airports, including London’s Heathrow Airport.

The cyberattack, which occurred on Friday, affected electronic check-in and boarding systems from Collins Aerospace. Brussels Airport said that passengers were able to check-in manually due to the attack, while other airports noted longer wait times were likely.

RTX, the parent company of Collins Aerospace, said it is working to rectify the issue. “The impact is limited to electronic customer check-in and baggage drop and can be mitigated with manual check-in operations,” the company said in a statement to Reuters. Fast Company reached out to RTX for comment but did not hear back by the time of publication.

According to FlightAware, Heathrow alone has seen at le

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