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US watchdog says F-35s flew half the time in 2024 due to Lockheed maintenance issues

By Thomson Reuters Dec 23, 2025 | 11:56 AM

Dec 23 (Reuters) – U.S. F-35 fighter jets were available to fly only half the time in 2024 due ‍to maintenance shortcomings by Lockheed Martin, a report from the Defense Department’s Office of the Inspector General said.

The availability of F-35 aircraft in 2024 was 50%, 17% below ‌the minimum performance requirement, the ‌Pentagon watchdog said.

According to the report, the average availability rate of F-35s was 50% because “(the Pentagon) did not always hold Lockheed Martin ​accountable for poor performance related to F-35 sustainment.”

“This occurred because the F-35 ‍JPO did not include ​aircraft readiness performance or other ​measurable contract requirements and did not enforce ‍material inspection and government property reporting requirements in the AVS contract,” the report said.

The audit found that the Pentagon paid Lockheed about $1.7 billion without any ‍economic adjustment even though the aircraft were unavailable to fly about half the time and failed ‍to ‍meet minimum military service requirements.

Lockheed ​Martin did not immediately respond ​to ⁠a Reuters request for comment.

The ‌F-35 is the Pentagon’s largest acquisition program, with lifetime costs estimated at more than $2 trillion to purchase, operate and sustain the aircraft.

(Reporting by Abhinav Parmar in Bengaluru; Editing by ⁠Alan Barona)