By Tim Kelly and Nobuhiro Kubo
TOKYO (Reuters) - Tokyo has secured cost cuts on support equipment for its next batch of six U.S. F-35 stealth fighter aircraft of around $100 million, according to sources and Japanese budget papers, on top of savings being finalised for all buyers of the high-tech jets.
The deal represents a rare case of Tokyo negotiating down the price of military hardware from its U.S. ally and underscores progress for the Lockheed Martin Corp-run F-35 program, which has faced criticisms over cost overruns and other problems.
U.S. President Donald Trump, who lashed the program as "out of control" in December, said on Monday he had been able to shave some $600 million from the latest U.S. deal to buy about 90 F-35s from Lockheed.
But defense analysts and sources downplayed news of those cuts, saying the discount hailed by Trump was in line with what had been flagged by Lockheed for months and would apply to other countries committed to the program.
Lockheed and the Pentagon did not directly respond to questions regarding the Japanese deal.
A spokesperson for the U.S. Defense Department office which runs the F-35 program said negotiations over the current batch of fighters, known in the industry as LRIP 10, was continuing.
"For every nation that buys an F-35 in LRIP 10, the base price of the F-35 will be the lowest in F-35 history," Lockheed spokesman Michael Rein said.
The price of the F-35 has been dropping with each new batch as Lockheed and the U.S. government ramp up production, helping to lower overall costs.
Four sources told Reuters Japan had further trimmed the price for its latest order, largely on ground support costs such as parts, logistics and technical assistance.
"We went through each item in detail and negotiated with the U.S.," said one of the sources in Japan with knowledge of talks.
To view a graphic on Lockheed Martin's F-35 fighter jet orders, click http://tmsnrt.rs/2kfLIef
For a graphic on Lockheed Martin's F-35 aircraft, click http://tmsnrt.rs/2jurTmk
COSTS DOWN
In a budget request last year, Japan's Ministry of Defence pegged the price of the six F-35s at 15.7 billion yen ($136.81 million) each. That had been cut to 14.6 billion yen when the budget was approved in December, in line with the 6-7 percent per plane reduction flagged by the Pentagon late last year.
The cost of support equipment dropped significantly, to 30.9 billion yen from 42.3 billion yen, according to the publicly available documents.
Cost cuts on such deals are typically done by removing some equipment or swapping out expensive components for cheaper ones.