Site 9 at Plant 42 is located at the southeast corner of the airfield, and was substantially developed by Rockwell for the production of the B-1 bomber, and the Space Shuttle. All 100 of the B-1s were assembled here. The site has two large assembly sheds, and one large warehouse-type structure. The larger shed, called Building 703, is now part of NASA’s Neil A. Armstrong Flight Research Center, the agency’s experimental flight center, located at Edwards Air Force Base. NASA has based its Airborne Science Laboratory planes here, including a DC-8 airliner that is used for a variety of research programs, including some related to satellite systems development. The other hangar, Building 704, is used by Kinkisharyo, which builds train cars for the Los Angeles light rail public transit system. The large warehouse building is used by UPS.