Lockheed Aircraft was founded in Hollywood, moved to Burbank Airport in 1928, grew quickly, and dominated the airport through the 1980s, when it moved its headquarters to Calabasas, and its production to other places. It built thousands of military planes at Burbank in World War II, and thousands more civilian and military aircraft after the war. From 1943 to 1989, a portion of its dozens of large structures around the east side of the airport were used by its Skunk Works division, which designed and built the U-2 spy plane, the SR-71 spy plane, and the F-117 stealth fighter/bomber, which were assembled and tested at other locations, including the secret airport it built with the CIA at Groom Lake, Nevada, known as Area 51. Skunk Works was officially moved to Air Force Plant 42 in Palmdale in 1989, and the company, which no longer built civilian aircraft, continued to vacate its buildings at Burbank, selling most off to developers in 1994. In 1995 it merged with a former rival, Martin Marietta, and became Lockheed Martin, which, 30 years later, is still one of the largest aerospace companies in the world.