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.
RTX, Collins Aerospace's parent, was not immediately available for comment.
The attack rendered automated systems inoperable at Brussels Airport, allowing only manual check-in and boarding procedures.
"This has a large impact on the flight schedule and will unfortunately cause delays and cancellations of flights," the operator said in a statement published on its website.
"The service provider is actively working on the issue and trying to resolve the problem as quickly as possible."
By around 7am local time, nine flights had been cancelled in Brussels and 15 flights were delayed by at least an hour.
Passengers with a flight scheduled for Saturday were advised to confirm their travel with airlines before heading to the airport.
Berlin's Brandenburg Airport said a service provider for passenger handling systems had been attacked.
The airport said it had subsequently cut connections to the systems, warning passengers to expect longer waiting times at check-in and boarding, as well as delays.
"The airport itself was not the target of the cyberattack and was only indirectly affected," the airport said.
Frankfurt Airport, Germany's largest, was not affected, a spokesperson said. An official from the operations control centre at Zurich Airport also said it had not been impacted.
with DPA
