Between 1942 and 1945, Douglas built 29,385 airplanes -- about 16 percent of all the U.S. airplanes produced -- and peak wartime employment at Douglas was recorded at 160,000 workers. During World War II, Douglas Aircraft rapidly expanded its operations to meet the need for military airplanes. In addition to the three Southern California plants, Douglas wartime plants also were located at Oklahoma City and Tulsa, Oklahoma, and near Chicago, Illinois. However, within six months of the end of World War II, Douglas had trimmed its workforce by 99,000 and closed its plants in Oklahoma City and Tulsa, and Chicago.