As of September 30, 2012, the company has received production orders for 95 F-35 aircraft of which it has delivered 26.

FORBES: Lockheed Still Faces Headwinds Despite Raised Guidance

The danger for Lockheed Martin is that if orders start to tumble, the F-35 could go into a death spiral.

ECONOMIST: The defence industry

The previous Labour government had placed orders for two new aircraft carriers to be equipped with the F-35B variant of the American-built joint strike fighter (JSF), which is capable of short take-off and vertical landing.

BBC: Carrier fighter jet U-turn cost ?74m, says audit office