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Pratt & Whitney Wins $2.8 Billion Contract for F-35 Lot 18 Engines

Pratt & Whitney Secures $2.8 Billion Contract for F-35 Lot 18 Engines
Pratt & Whitney has been awarded a $2.8 billion contract to supply 141 F135 engines for the Lot 18 production batch of F-35 Lightning II fighters, the U.S. Department of Defense announced on August 22, 2025. Managed by the Navy’s Naval Air Systems Command (NAVAIR), the agreement encompasses propulsion systems, spare parts, and support services for all three F-35 variants. Deliveries are scheduled to continue through February 2028.
Scope and Significance of the Contract
The F135 engine serves as the sole powerplant for the F-35 Joint Strike Fighter, powering the conventional take-off and landing (CTOL), carrier (CV), and short take-off and vertical landing (STOVL) models operated by the U.S. Air Force, Navy, Marine Corps, and allied international partners. Reflecting the multinational nature of the F-35 program, the contract’s funding is drawn from a combination of U.S. Navy and Air Force procurement budgets, foreign military sales, and contributions from international participants.
This award expands Pratt & Whitney’s existing multiyear F135 contract, adding the 141 engines required for Lot 18 aircraft. These engines will support 145 F-35s slated for delivery under Lockheed Martin’s December 2024 airframe contract, which is valued at up to $11.8 billion. The aircraft deliveries are expected to be completed by mid-2027.
Cost and Program Enhancements
According to Air & Space Forces Magazine, the average price per Lot 18 F135 engine is approximately $20.4 million. When combined with airframe costs, the average price per F-35 in this lot is projected to exceed $101 million, though actual prices vary by variant. For previous production lots, the average flyaway cost was $82.5 million for the F-35A, $109 million for the F-35B, and $102.1 million for the F-35C. The F-35 Joint Program Office has noted that Lot 18 and subsequent aircraft will incorporate upgraded systems and capabilities, including Technology Refresh 3 and Block 4 enhancements, which contribute to the increased costs.
Industrial Impact and Challenges
The contract is expected to sustain more than 67,000 jobs and support 240 suppliers across the United States, underscoring the program’s significant industrial footprint. Pratt & Whitney’s ongoing collaboration with its supplier network is exemplified by recent awards such as a $21 million contract to Hunting for precision engine components.
While the contract reinforces Pratt & Whitney’s leadership in military propulsion, it also presents challenges related to production capacity, supply chain logistics, and the integration of new technologies. Market analysts suggest that the award could bolster investor confidence in RTX, Pratt & Whitney’s parent company, given its established track record in defense programs. Meanwhile, competitors such as Rolls-Royce and General Electric are expected to intensify efforts to secure future F-35 engine contracts as the global fighter market continues to evolve.
The Lot 18 engine order marks a significant milestone in the F-35 program, reflecting both the growing demand for advanced fighter capabilities and the complexities involved in sustaining a multinational defense enterprise.

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