sentences:  The "Air Ministry (Heston and Kenley Aerodromes Extension) Act 1939" authorised the compulsory purchase of land, and road closures needed for further expansion.The plans met objections, especially from the Heston Aircraft Company, whose production facility on the site was planned to be demolished in December 1939.In 1939 work on this expansion started, demolishing some houses in or near Cranford, including Tentlow Farm, and cutting down fruit trees, but the start of the Second World War stopped this.