© Espen Solli/Oslo Lufthavn ASAn otherwise sunny day, free of weather problems at Oslo's main airport, ended up with massive disruption and baffled officials.
The skies were blue and sunny, the runways clear of snow and ice, and traffic should have flowed routinely through Oslo's main airport at Gardermoen (OSL) on Thursday after a rough winter. Instead, the airport was forced to close on a busy spring afternoon, because of a mysterious aircraft that entered its air space and stayed there.

Click here to read the rest of the story