F-35 Fleet Readiness Crisis: Only 25% Fully Mission Capable 2026

The F-35 Lightning II, America's most advanced fighter jet, faces a critical readiness crisis: only 25% of the US fleet is fully mission capable, according to a new GAO report. With over 800 aircraft in service, this means just one in four can perform all assigned missions at any given time.

The Government Accountability Office (GAO) findings highlight a steady decline in readiness rates over the past five years, raising concerns about the Pentagon's ability to maintain air superiority.

What the GAO Report Reveals About F-35 Readiness

The GAO's latest assessment measures two key metrics: mission capable rate (the percentage of time an aircraft can fly and perform at least one mission) and full mission capable rate (the percentage of time it can perform all assigned missions).

In fiscal year 2025, the US F-35 fleet achieved a mission capable rate of 44% and a full mission capable rate of just 25%. This means that while nearly half the fleet can perform some missions, only a quarter is fully ready for any task.

The report also shows a worrying trend: between FY2021 and FY2025, the mission capable rate dropped from 67% to 44%, and the full mission capable rate fell from 38% to 25%.

Why F-35 Readiness Is Declining

The decline is not due to a single factor but a combination of maintenance challenges, supply chain issues, and the increasing complexity of the aircraft's systems.

According to the GAO, the F-35's advanced stealth coatings, sensor fusion, and software require extensive upkeep, often exceeding the capacity of maintenance crews. Spare parts shortages and depot-level maintenance backlogs further exacerbate the problem.

Additionally, the fleet's aging airframes and the high operational tempo have accelerated wear and tear, leading to more frequent unscheduled repairs.

Impact on US Military Strategy

The F-35 is the backbone of US tactical aviation, planned to serve for decades. Low readiness rates undermine its role as a deterrent and could strain allied operations that rely on the aircraft.

With only 25% fully mission capable, the US military may struggle to generate sufficient sorties in a high-intensity conflict, potentially affecting global power projection. The background to this story is set out in Airbus Rebuilds Spain's Submarine Hunter in Seville. The background to this story is set out in Pentagon Plans Giant Nets to Shield F-35 Jets from Drones.

The Pentagon has acknowledged the issue and is investing in maintenance infrastructure and supply chain improvements, but progress has been slow. The longer history behind the story is traced in Russian Frigate Fires Warning Shots at British Yacht Near Isle of Wight. More on the surrounding debate is collected in Spain's Harrier Fleet Gets Life Extension to 2032 Without F-35.

Key Takeaways from the GAO Report

• Only 25% of the US F-35 fleet is fully mission capable, down from 38% in FY2021.
• Mission capable rate (can perform at least one mission) is 44%, a significant drop from 67%.
• The decline is attributed to maintenance challenges, parts shortages, and high operational demands.
• Low readiness impacts US air superiority and allied interoperability.
• The Pentagon is working on fixes but faces systemic issues.

F-35 Readiness Rates Over Time

The table illustrates the steady decline in both metrics, underscoring the growing readiness gap. The background to this story is set out in US Expands Nuclear-Capable B-52 Base in Spain: What It Means. A related thread runs through F-35 Fighter Jet Parts Missing in Hong Kong: Australia Investigates. Earlier coverage in F-35 Crashes Now a National Security Challenge for Spain shows how the argument developed.

What to Watch Next

The GAO report recommends that the Pentagon reassess its maintenance strategies and improve data collection on readiness. Congress has also expressed concern, with some lawmakers calling for stricter oversight. A closer look at the same subject appears in Trending: latest articles. Anyone following the wider picture can start with South Korea's KF-21 Fighter Nears Operational Service Milestone. The same theme surfaces in FCAS Collapse: Spain and Sweden's Last Chance to Stop the F-35, which takes a different angle.

As the F-35 fleet continues to grow, addressing these readiness issues will be crucial to maintaining US air dominance. Stakeholders should monitor upcoming budget allocations and maintenance contracts for signs of improvement. Context on how this played out before sits in Pete Hegseth's Leadership Crisis Threatens US Military Readiness. A companion piece, Finland's Massive Civil Defense Drill Tests Readiness Against Russia, approaches the same subject from another angle.