NASA announced Tuesday it has exercised $318 million in contract extension options and extended Boeing’s contract to support continued construction and operation of the International Space Station.

The action provides a one-year extension – to Sept. 30, 2008, of the Boeing contract, which covers the U.S. segment of the orbiting facility and other engineering services. The original cost-plus-award-fee contract began Jan. 13, 1995. Its total value to date, including options, is $13.3 billion.

The services include hardware and software development, as well as sustaining engineering and post-production support for the U.S. segment of the station and for hardware and software common to the ISS international partners.

The work also covers managing the majority of station subsystems and specialty engineering disciplines such as materials, electrical parts, environments and electromagnetic effects.

Boeing will perform work on the contract at NASA's Johnson Space Center in Houston, the Kennedy Space Center in Florida, Marshall Space Flight Center in Alabama, and other locations in the United States and elsewhere, the space agency said.