Fallout from a cyberattack that affected check-in systems at several European airports has extended into a second full day. Passengers are facing dozens of cancelled and delayed flights and airport teams are scrambling to limit the damage to travel plans. Starting late on Friday, key airports in Brussels, London and Berlin were hit by disruptions to electronic systems that snarled up check-in. Many other European airports were unaffected.  The cyberattack affected systems of US-based Collins Aerospace that help passengers check in, print boarding passes and dispatch their luggage.