British air traffic control outage, mass flight cancellations
A "very complex" technical failure of the British air traffic control system caused approximately 1,300 flight cancellations on Tuesday, then another 177 on Wednesday despite the announced resolution of the malfunction. Several airports including Stansted, London City, Manchester, Birmingham and Gatwick were affected.
The scale of disruptions affects thousands of travellers and illustrates the fragility of critical air infrastructure in Europe.