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

What You Need To Know • A cyberattack targeting check-in and boarding systems has disrupted air traffic at several major European airports • On Friday night, the attack hit a service provider affecting airports like Brussels and Berlin's Brandenburg • Brussels Airport said the incident has forced manual check-ins, causing significant delays • Airports were advising travelers to check their flight status and apologize for the inconvenience

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 Brusse

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