As promised, the price of an F-35 joint strike fighter continues to come down as production rates increase.

The plane’s maker, Lockheed Martin, announced Friday that its latest $11.5 billion contract calls for the delivery of 141 F-35s at the lowest per aircraft price so far.

The contract fixes the price of the F-35A, the standard model used by the Air Force, at $89.2 million, a 5.4 percent reduction from the $94.3 million it cost for an A model from the last production lot.

This will be the 11th consecutive year the cost of an F-35A was lowered, Lockheed Martin said.

Other models also saw price reductions. The F-35B, the short-takeoff and vertical-landing variant used by the Marine Corps, will cost $115.5 million, down from $122.4 million, a 5.7 percent reduction.

That model saw its first use in combat in Afghanistan Thursday where it conducted a strike against a Taliban target in support of U.S. troops on the ground.

And the F-35C, designed to take off and land on an aircraft carrier, is priced at $107.7 million per copy, down from $121.2 million, a 11.1 percent reduction.

Of the 141 planes in what’s known as "Low-Rate Initial Production Lot 11," 91 will go to the U.S. military, 28 to international partners, and 22 for foreign military sales customers. Delivery is set for 2019.

“Driving down cost is critical to the success of this program,” said Vice Adm. Mat Winter, F-35 program executive officer, in a statement.

“We are delivering on our commitment to get the best price for taxpayers and warfighters. This agreement for the next lot of F-35s represents a fair deal for the U.S. Government, our international partnership and industry. We remain focused on aggressively reducing F-35 cost and delivering best value.”

With a total research, development, and production cost of $406 billion, the F-35 joint strike fighter program is the most expensive weapons buy in Pentagon history.