Article: F-35 looks to be costlier than planned.

Several adjustments related to the F-35 Joint Strike Fighter program could make the plane more expensive for European buyers.

Rolls-Royce and General Electric earlier this week announced they would make adjustments to an alternate engine for the Lockheed Martin fighter plane, possibly resulting in additional development costs. The companies decided to redesign the engine after malfunctions during testing.

The primary engine for the F-35 is being built by Pratt & Whitney, a daughter company of United Technologies. Washington has green-lighted funding for an alternate engine to boost the plane's flexibility and its performance in high-altitude fighting.

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