Flights were temporarily diverted and halted at Copenhagen and Oslo airports due to sightings of large unidentified drones in the vicinity. Danish police reported that 2-3 capable drones were observed flying over Copenhagen Airport for hours, prompting an investigation. The unexpected drone activity led to widespread flight cancellations and diversions, impacting over 20,000 passengers and straining hotel accommodations in the area. While operations have since resumed at Copenhagen Airport, the incident raised concerns about airspace security, with officials linking the drone incursions to a broader pattern of violations across Europe.