The space-shuttle era may end as soon as mid-2010, NASA said Tuesday as the agency announced its final planned fight in a program almost three decades old.

The orbiter Endeavour is slated to lift off May 31, 2010, for the space station, carrying a porchlike structure that will support scientific experiments in the vacuum of space, NASA said in statement.

NASA is working to finish construction on the orbiting outpost, which is about two-thirds built. Shuttle flights are also planned for Oct. 8 and Nov. 10 this year, followed by five flights in 2009 and a total of three in 2010.

President George W. Bush has ordered the fleet be retired by the end of September 2010.