A cyberattack targeting check-in and boarding systems disrupted air traffic and caused delays at several of Europe’s major airports on Saturday, officials said, though the initial impact appeared to be limited.

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.

Airports said the issue centered around a provider of check-in and boarding systems — not airlines or the airports themselves.

Collins Aerospace, whose systems help passengers check themselves in, print boarding passes and bag tags and dispatch their luggage from a kiosk, cited a “cyber-related disruption” to its MUSE (Multi-User System Environment) software at “select airports.”

As the day wore on, the fallout appeared to be contained.