F-35 - Hvor mange blir det egentlig?

Fra avisa The Independent sakser jeg følgende fra i går:
Paul Livingston, director of aeronautics for Lockheed Martin in the UK, said it would provide a "huge boost" to British industry.
He said: "The basic core programme of F-35 is going to build 3,173 aircraft for multiple users.
 United Kingdom, Italy, the Netherlands, Canada, Turkey, Australia, Norway and Denmark har spyttet penger inn i prosjektet, men Japan og Singapore er også interesserte parter.