This polygon covers the Doncaster Sheffield airport, which was opened in 2004. It was constructed on land that had been part of RAF Finningley. The RAF base was opened in 1936 in response to German re-armament. Expansion during World War 2 saw more runways added. In the mid 1950s the runway was further upgraded to accommodate Vulcan bombers. Nuclear weapons storage facilities were also added. The base became a training facility from the 1970s onwards, becoming famous for its air show. It closed as a military base in 1996. Prior to this it was part of the Finningley Park Hall estate. The origins of the park and estate are thought to lie in a medieval deer park. This area may have lain just outside (to the north of) the boundary of the park and have been agricultural land enclosed in a piecemeal fashion. Legibility of the former character is fragmentary as a very few of the military buildings remain.