Some of Europe's biggest airports, including the region's busiest, London's Heathrow, are racing to restore normal operations after hackers disrupted automatic check-in systems.

Hackers on Saturday targeted check-in and boarding systems provider Collins Aerospace, owned by RTX, disrupting operations at Heathrow, Berlin Airport and in Brussels, where passengers faced long queues, cancellations and delays.

Disruption had eased significantly by early Sunday despite some continuing delays, according to airport officials and data, while regulators said they were investigating the source of the cyberattack.

Brussels Airport said 45 of 257 scheduled departing flights on Sunday were cancelled but operational adjustments had kept waiting times down.

"There are delays between 30 and 90 minutes,"

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