The World War II exhibit also highlights Tulsa's contributions to the war, with presentations on the Spartan Aircraft Company, the Spartan College of Aviation and Technology and the Douglas Bomber Plant. A commercial aviation exhibit presents historic uniforms, documents, and photos from American Airlines, Trans World Airlines and other commercial carriers. American Airlines gets special attention due to the presence in Tulsa of the largest private aircraft maintenance base in the world, owned and operated by American. The space exhibit presents information on Tulsa's participation in the manned and unmanned space programs, beginning with the first Peaceful Uses of Space Conference held in Tulsa on May 26, 1961. Oklahoma astronauts are honored, while visitors have the opportunity to operate a mockup of the Space Shuttle's robotic arm.