Singapore has concluded three bilateral Open Skies Agreements (OSAs) with the Scandinavian countries, comprising Denmark, Norway and Sweden.
With these OSAs, airlines of both Singapore and the Scandinavian countries will be able to fly between Singapore and any point in Scandinavia, via and beyond to any third country, without restrictions in capacity, frequency or aircraft type. The OSAs are even more liberal than conventional OSAs, as it provides for unlimited "hubbing" rights for cargo airlines of Singapore and the Scandinavian countries. As an illustration, a Singapore cargo airline will be allowed to base its aircraft in any point in Scandinavia and use this as a hub to operate to any other country, without any restriction on destination, frequency of service or capacity. The same applies to Scandinavian carriers.
http://www.changiairport.com.sg/Journalist/Press_Releases/2008/news_0005.html?__locale=en&site=caas