The world’s most experienced aerospace industry companies, many of them UK based, are helping develop the F-35 Lightning II Joint Strike Fighter (JSF), an affordable 5th generation fighter for the 21st century. The programme is now at an advanced stage of development with the first conventional variant having flown on 15th December 2006 and the F35-B STOVL version having just achieved its first flight. Testing on all variants continues and initial deliveries should begin in 2010.