NASA added $1.24 billion to Boeing’s international space station (ISS) sustainment contract to keep providing engineering support for hardware and software on the orbital outpost through 2015, St. Louis-based Boeing Defense, Space & Security announced Sept. 14.

“Boeing’s knowledge of the International Space Station allows us to safely fly and operate the station to 2015, set the stage to enable ISS operations until 2020, and potentially extend operations through 2028,” Joy Bryant, Boeing’s vice president and program manager for ISS, said in a statement.

Boeing will perform the work at NASA’s Johnson Space Center in Houston, Kennedy Space Center in Florida and Marshall Space Flight Center in Huntsville, Ala., as well as at Boeing sites in Houston, Huntsville and Huntington Beach, Calif.