Royal Naval Air Station Stretton (HMS Blackcap), was an airfield in the village of Appleton Thorn, though named for the neighbouring village of Stretton, south of Warrington, in Cheshire, England. Although the main runway remains, the northerly part of the airfield is now HM Prison Thorn Cross and an industrial estate. In the 1970s, the M56 motorway was built across the former air station.