The total number of airplanes that will be bought by the partnership is 3,173. That's exclusive of any airplanes that are bought by third parties like Israel, which will add to the number. The total expected buy of joint strike fighters is anticipated to be around 5,000 over the life of the program, making this probably the last major manned tactical aircraft program that we'll see certainly in this century.
On September 15th, 2010. See this statement in context.