Authorities in both countries are cooperating to determine if there was a link between the incidentsMajor airports in Norway and Denmark have faced disruption after multiple drone sightings near runways caused widespread delays and cancelations on Monday and early on Tuesday. In Denmark, police said two or three large drones were spotted around Copenhagen Airport, the busiest in the Nordic region. In Norway, Oslo Airport closed its airspace from midnight after a drone was spotted, a spokesperson for airport operator Avinor told Reuters. Hansen said police in Denmark and Norway are cooperating to see if the incidents are connected. The incidents come just days after major European airports faced electronic check-in and boarding outages that caused widespread delays and cancelations from Friday through Sunday.