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