During the 2000s, further efforts were made by Volvo Aero towards close cooperation with various industrial partners. During July 2008, Volvo Aero and Rolls-Royce signed a risk-and-revenue-sharing agreement for the Rolls-Royce Trent XWB turbofan engine, under which Volvo Aero developed and manufactured the intermediate compressor case, a key engine component; the firm estimated this contract's value to be SEK40 billion over 40 years. In November 2008, Pratt & Whitney and Volvo Aero Norge agreed for the latter to produce diffuser case components for the Pratt & Whitney F135 engine; that same year, Volvo Aero secured work on the Pratt & Whitney PW1000G engine as well. In June 2009, SNECMA and Volvo Aero agreed on the principles of a five-year partnership between the two companies in the space propulsion sector.