London, Sept. 21 -- 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 travellers 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.P19...