A cyberattack targeting check-in and boarding systems disrupted air traffic and caused delays at several of Europe’s major airports on Saturday.

While the impact on travelers appeared to be limited, experts said the intrusion exposed vulnerabilities in security systems.

The disruptions to electronic systems initially reported at Brussels, Berlin’s Brandenburg and London’s Heathrow airports meant that only manual check-in and boarding was possible. Many other European airports said their operations were unaffected.

“There was a cyberattack on Friday night 19 September against the service provider for the check-in and boarding systems affecting several European airports including Brussels Airport,” said Brussels Airport in a statement, initially reporting a “large impact” on flight schedu

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