米露欧日加、宇宙機関長の共同声明でISSの2028年までの運用延長可否を検討中と表明
They [= The Heads of Agency] noted that there are no identified technical constraints to continuing ISS operations beyond the current planning horizon of 2015 to at least 2020 and that the Partnership is currently working to certify on-orbit elements through 2028.
