A cyberattack at a service provider for check-in and boarding systems has disrupted operations at several major European airports including London’s Heathrow, Brussels and Berlin, causing flight delays and cancellations on Saturday.

Collins Aerospace, which provides check-in and boarding systems for several airlines across multiple airports globally, is experiencing a technical issue that may cause delays for departing passengers, London’s Heathrow Airport said on Saturday, having warned of delays.

RTX Corporation, Collins Aerospace’s parent, was not immediately available for comment outside of US business hours.

Operations were disrupted at London’s Heathrow, Brussels and Berlin. TOLGA AKMEN/EPA/Shutterstock

The attack has rendered automated systems inoperable, allowing only manual c

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