The F-35 Joint Program Office doesn’t expect to sign a contract with Lockheed Martin for production Lots 18 and 19 until the spring, while a deal for the engines powering those aircraft may take longer to reach, a spokesperson told Air & Space Forces Magazine.
While that timeline pushes the contracts into the administration of incoming President Donald Trump, sources told Air & Space Forces Magazine they have discounted the idea that the government has slowed negotiations in hopes that Trump will intervene in the program and demand or impose price reductions.
The JPO and Lockheed announced a “handshake deal”—a basic understanding of costs and quantities with details still to be worked out—on airframe production Lots 18 and 19 in December, but a similar agreement with Pratt & Whitney for the F135 engines is still pending.
The JPO “plans to definitize the air vehicle contract in the spring,” a spokesperson said in response to queries, adding that the office “plans to award the engine contract in 2025,” suggesting that will happen even later in the year.
Unit costs for the three variants of the F-35—A, B and C—will not be released until both the air vehicle and engine contracts are signed, the spokesperson said.
A Pratt & Whitney spokesperson was not immediately able to offer comment on the extended engine negotiations, and a Lockheed Martin spokesperson said the company is making no public comments until its January earnings report comes out.
Just before Christmas, the Pentagon announced a deal in principal to pay up to $11.8 billion for the next 145 F-35s as part of Lot 18. That would translate to a per-jet price of some $82 million, but that cost does not include the engine. The previous contract, for lots 15-17, was for $75 million per aircraft without the engine.
Based on previous contracts, the F135 is estimated to have a price of about $15 million per copy, mostly dependent on whether it includes the “lift fan” feature in the short takeoff/vertical landing (STOVL) version of the powerplant.
Combining the two would suggest the F-35’s full cost under Lot 18 will be a cross-variant average of around $97 million per airframe.
Throughout the program, the F-35A conventional takeoff and landing (CTOL) version used by the Air Force is the lowest-price version, while the F-35B short takeoff and landing version used by the Marine Corps is the priciest, and the Navy’s carrier-based F-35C comes in between the other two in cost.
Trump may have keen interest in the F-35’s price as he returns to the White House. He intervened in the program in 2017, even before taking office, pressuring Lockheed for lower costs and higher employment on the program; both of which were effectively already in motion because the F-35 production volume was rising sharply at that time.
Elon Musk, co-chair of Trump’s so-called Department of Government Efficiency, has recently ridiculed the F-35 as obsolete, and has said the U.S. needs to invest more substantially in autonomous combat drones, even though Trump himself spoke favorably of the program during the presidential campaign.
However, the Pentagon has been working on this most recent contract for months. The handshake deal was originally expected to be inked in December 2023. Lockheed and program officials have telegraphed that the new unit cost would be higher due to inflation, labor and supply chain issues, and the fact that the latest jets are more complex and have the foundational elements for the Block 4 upgrade.
It’s not clear whether the F135 Engine Core Upgrade (ECU), a series of improvements needed to give the F135 more thrust, longevity and electrical power generation capability, is a major factor in the extended negotiations with Pratt & Whitney.
While the JPO has typically negotiated three lots at a time, Lot 20 is being negotiated separately because it could be the first in a series of multiyear buys. While some aspects of multiyear buys are already in place—allies are buying F-35s under the “block buy” rubric—the multiyear status requires that the program complete operational testing and pass Milestone C, full-rate production. That declaration was made in March 2024.
Negotiations have also been extended and complicated by the yearlong hold on F-35 deliveries. The hold was due to jets being built with the Tech Refresh 3 hardware and software, testing of which was still underway when those jets rolled off the production line. The hold was lifted in July when the program executive officer, Lt. Gen. Michael Schmidt, deemed the TR-3 configuration safe for routine operations.