Why It Matters

The U.S. Air Force is struggling to keep its aircraft combat-ready, and a new federal watchdog report says the problem runs deeper than publicly acknowledged. Maintenance delays at Air Force depot maintenance facilities have grown considerably since fiscal year 2019, reducing the number of aircraft available for both operations and training. What makes this finding particularly troubling is not just the delays themselves, but the way the Air Force has been measuring and reporting them.

The Government Accountability Office released its findings on May 14, 2026, after examining the three Air Logistics Complexes that form the backbone of the service's depot-level maintenance system. The report's conclusion is direct: the Air Force needs to fix how it tracks delays, how it manages its workforce, and how it competes for the skilled tradespeople who keep America's warplanes flying.

A Fleet Under Pressure

The Air Force's three depot facilities (Ogden Air Logistics Complex in Utah, Oklahoma City Air Logistics Complex in Oklahoma, and Warner Robins Air Logistics Complex in Georgia) are responsible for the heavy maintenance work that keeps aircraft like the F-16 fighter and C-17 cargo transport in service. These are not minor tune-ups. Depot-level work involves deep inspections, structural repairs, and systems overhauls that can take months to complete.

The stakes are straightforward: aircraft sitting in a depot bay are aircraft that cannot fly training missions or respond to operational requirements. As the Air Force works to rebuild readiness following more than two decades of continuous conflict that degraded its fleet, the efficiency of these three facilities is central to whether that recovery succeeds.

The GAO found that aircraft maintenance delays have increased considerably since fiscal year 2019. But the full scale of those delays has not been visible in the Air Force's own reporting.

How the Numbers Get Obscured

At the core of the GAO's findings is a measurement problem with serious consequences for Air Force readiness.

The Air Force tracks depot maintenance performance using a metric called the "target completion date." When an aircraft enters a depot, a target date is set for when maintenance should be finished. When that date is missed, the Air Force has been reporting performance against a revised target, not the original one.

The GAO found this practice systematically understates how severe the delays are. Depots were frequently revising their target completion dates after maintenance had already been completed, effectively adjusting the metric to match actual performance after the fact. The revision process was also applied inconsistently across depots and aircraft program offices, making comparisons across the fleet unreliable.

The result: leadership and policymakers reviewing Air Force reports on depot maintenance timeliness were not seeing the full picture. Unplanned work discovered during maintenance (a significant driver of delays) was not being captured in a way that allowed for meaningful analysis.

The GAO is recommending the Air Force use the original target completion date as its primary performance metric, establish consistent rules for when and how revisions can be made, and build out a more rigorous system for categorizing and analyzing the root causes of delays. The Air Force concurred with eight of the ten recommendations and partially concurred with two related to root cause analysis, agreeing to capture the relevant data but seeking flexibility on where to store it.

Aviation Depot Staffing

Beyond the tracking problem, the GAO identified a workforce challenge that cuts across all three Air Force depot maintenance facilities. While each of the three depots has maintained overall fill rates of 90 percent or more since 2020, that headline figure masks shortages in the occupations that matter most: engineers and mechanics.

These are precisely the workers who perform and oversee the complex technical work that depot maintenance requires. And they are workers the private sector also wants.

The GAO found that competition with private industry is the primary barrier to recruiting and retaining personnel in these critical roles. The depots have taken some steps to address the gap, selectively offering incentives and emphasizing the nonfinancial benefits of federal employment, but those efforts have been limited in scope and effectiveness.

The core problem, according to the GAO, is that the Department of Defense has never conducted a comprehensive assessment of how Air Force depot pay compares to private sector compensation for these occupations. Without that baseline, it is difficult to design targeted strategies to close the gap.

The GAO is recommending that the Deputy Assistant Secretary of Defense for Product Support conduct and periodically update such an assessment, and then use the results to develop tailored strategies for addressing pay gaps, staffing shortages, and skill shortages at the depots. DOD concurred with both recommendations.

The Congressional Mandate Behind the Report

The GAO study was not self-initiated. It was mandated by a provision in Senate Report 118-188, which accompanied legislation for the National Defense Authorization Act for Fiscal Year 2025. The NDAA is the annual defense policy bill that sets priorities and directs oversight of the Pentagon, and the provision directing this study reflects congressional concern about whether the Air Force's depot system can support the service's readiness goals.

The report arrives at a moment when military readiness is a consistent pressure point in defense debates. An aging fleet, high operational tempo, and a competitive labor market have all converged on the depot system in ways that demand more than incremental fixes.

The GAO's ten recommendations, if implemented fully, would require the Air Force and the Office of the Secretary of Defense to overhaul how they measure performance, understand their workforce challenges, and respond to both. The question now is whether the partial concurrences on root cause analysis will be enough to produce the accountability the watchdog is calling for.

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