The production team moved to the Bonneville Salt Flats to film three scenes, then returned to California to film in various places around Los Angeles, including Hughes Aircraft where sets for the cable company and Area 51 interiors were constructed at a former aircraft plant. Sets for the latter included corridors containing windows that were covered with blue material. The filmmakers originally intended to use the chroma key technique to make it appear as if an activity was happening on the other side of the glass, but the composited images were not added to the final print because production designers decided the blue panels gave the sets a "clinical look". The attacker hangar set contained an attacker mockup wide that took four months to build. The White House interior sets used had already been built for "The American President" and had previously been used for "Nixon". Principal photography completed on November 3, 1995.