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Aug 21 (Reuters) – The U.S. government now estimates it will

cost $857 billion to operate and maintain a fleet of more than

2,000 Lockheed Martin Corp F-35 fighter jets over 55

years, a drop of more than 20 percent from the previous estimate

of more than $1 trillion, according to a senior defense

official.

The new estimate reflects actual data about the airplane’s

performance and revised assumptions about how it will be used in

combat.

The new estimate was first reported by Bloomberg on

Wednesday. The F-35 Joint Strike Fighter is the costliest

weapons program in U.S. history.