Airports in Copenhagen and Oslo reopened on Tuesday, hours after unidentified drones in their airspace caused dozens of flights to be diverted or cancelled, disrupting thousands of passengers. Which capable actor, I do not know.”He said “several large drones” flew over the Copenhagen airport for more than three hours late on Monday. The Copenhagen airport is located on the coast of the Oresund Strait, between Sweden and Denmark. Copenhagen airport officials said air traffic had resumed early Tuesday but 20,000 passengers were affected by 31 flight diversions and more than 100 cancellations. A total of 14 flights were diverted from the Oslo airport, she said.