BERLIN (Reuters) -Some of Europe’s biggest airports, including the region’s busiest Heathrow, raced on Sunday to restore normal operations to automatic check-in systems after disruption caused by hackers a day earlier.

The hacking incident hit check-in and boarding systems provider Collins Aerospace, owned by RTX, disrupting operations on Saturday at London’s Heathrow, Berlin Airport and in Brussels, where passengers faced long queues, dozens of cancellations and delays.

Disruption had eased significantly by early Sunday despite some continuing delays, airport officials and data showed, while regional regulators said they were investigating the origin of the hacking incident.

The disruption is the latest in a string of hacks to hit sectors from healthcare to autos. A breach at carmaker

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