Farnborough, Hampshire, UK. 16th July, 2014. Visitors to the 2014 Farnborough Airshow were disappointed to find that they could only see a mock-up of the new Lockheed Martin F-35 "Lightning II" Joint Strike Fighter. Washington decided it was too risky to fly the real aircraft across the Atlantic over fears after the model suffered a recent engine fire. The aircraft is due to be used on the UK's new aircraft carriers and is the world's most expensive weapons project, costing approximately $400bn (£233bn). Credit: Steve Nichols/Alamy Live News

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