Factbox: What does Lockheed's F-35 fighter jet really cost?

Lockheed Martin Corp is developing and building the F-35 Joint Strike Fighter, the Pentagon's most expensive weapons program, for three U.S. military branches and eight international partners.

The Pentagon released new cost projections for 78 major weapons programs on Thursday, including the F-35 program which showed the first decline in cost after years of increases and restructurings.

The partners who are helping fund the F-35's development include Britain, Australia, Canada, Turkey, Italy, Norway, Denmark and the Netherlands.

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