A September GAO report says the F-35 Block 4 modernization is delayed at least until 2031—around five years behind original plans—and that the Joint Strike Fighter program is experiencing cost overruns and delivery shortfalls. GAO urges the Defense Department to reassess Lockheed Martin's production capacity, incentive fees and development practices.
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F-35 Block 4 Modernisation Slips Two Years Amid Ongoing Development and Installation Problems • militarywatchmagazine.com
Critical F-35 Weapons Update Delayed Five Years, Threatening Combat Capability • armedforces.press
GAO: F-35 Block 4 Upgrades Delayed Two Years; Cost Estimates Still Unclear • defence-industry.eu
GAO: All 110 F‑35s Delivered in 2024 Were Late — Average Delay 238 Days Cited, TR‑3 Hardware Blamed • nationalsecurityjournal.org
GAO: Incentive Payments Failed to Remedy F‑35 Block 4 Delivery Delays, Wasting Millions • airforce-technology.com
GAO: F‑35 Block 4 Five Years Delayed, $6B Over Budget — Weapons Capability at Risk • nationalsecurityjournal.org
GAO: F‑35 Programme “Overpromises and Underdelivers” — Average Deliveries 238 Days Late • aerospaceglobalnews.com
GAO: F-35 Upgrade Hit by Cost Overruns and Production Delays • Stars and Stripes
GAO: F-35 Program Hit by Significant Cost Overruns and Delivery Delays • National Defense
F-35 Block 4 upgrade delayed until at least 2031: GAO • Breaking Defense
