An industrial miracle took place at the Fairfax Airport, on the shores of the Missouri River, between 1941 and 1945. A massive factory was quickly built and a large modification center was soon added. At its peak, over 24,000 greater Kansas City–area residents were employed by North American Aviation, Inc. Their goal was to build as many twin-engine B-25 Mitchell medium bombers for wartime service as possible. Their success was the construction of an unprecedented 6,608 aircraft. The B-25 Mitchell served with distinction in every theater of World War II, and significant numbers of them were provided to Allied nations. Many B-25s have been preserved, and some of them remain airworthy today. They can be seen on static display or in flight at air shows all across America.