Pentagon Says Cost to Retrofit F-35s Drops $500 Million

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The Pentagon projects that costs to retrofit Lockheed Martin Corp.’s F-35 jets, the costliest U.S. weapon system, have dropped by at least $500 million.

The estimate on upgrades for the first five contracts of 90 aircraft has dropped to about $1.2 billion from $1.7 billion, the Pentagon said in a new report to Congress on “concurrency.” That’s the system under which the fighters are being built even as they’re still in development.