A US triservice formation of the US Air Force F-35A (lead), the US Marine Corps F-35B, and the US Navy F-35C. (US Air Force)

On 30 May the US Government Accountability Office (GAO) released a report about the Lockheed Martin F-35, finding that the programme has not adequately explained a cost increase of USD13.4 billion since 2019, that the upgraded Block 4 version has run into technical snags and a USD1 billion cost increase, and that the US Department of Defense (DoD) has not fully defined requirements for an engine cooling system upgrade.

The USD13.4 billion increase is because of greater acquisition costs, the GAO wrote. “The programme attributes the increased procurement cost to additional years of costs related to airframe and engine production, along with support costs for equipment, technical data, and training,” the GAO wrote. “According to programme officials, the programme is deferring the delivery of these 215 aircraft to later years at the request of the air force.” F-35 development costs have increased by a total of USD21.1 billion between 2012 and 2021, the GAO found. The programme's total 77-year lifespan cost now hovers around USD1.7 trillion.

A US triservice formation of the US Air Force F-35A (lead), the US Marine Corps F-35B, and the US Navy F-35C. (US Air Force)

On 30 May the US Government Accountability Office (GAO) released a report about the Lockheed Martin F-35, finding that the programme has not adequately explained a cost increase of USD13.4 billion since 2019, that the upgraded Block 4 version has run into technical snags and a USD1 billion cost increase, and that the US Department of Defense (DoD) has not fully defined requirements for an engine cooling system upgrade.

The USD13.4 billion increase is because of greater acquisition costs, the GAO wrote. “The programme attributes the increased procurement cost to additional years of costs related to airframe and engine production, along with support costs for equipment, technical data, and training,” the GAO wrote. “According to programme officials, the programme is deferring the delivery of these 215 aircraft to later years at the request of the air force.” F-35 development costs have increased by a total of USD21.1 billion between 2012 and 2021, the GAO found. The programme's total 77-year lifespan cost now hovers around USD1.7 trillion.

A US triservice formation of the US Air Force F-35A (lead), the US Marine Corps F-35B, and the US Navy F-35C. (US Air Force)

On 30 May the US Government Accountability Office (GAO) released a report about the Lockheed Martin F-35, finding that the programme has not adequately explained a cost increase of USD13.4 billion since 2019, that the upgraded Block 4 version has run into technical snags and a USD1 billion cost increase, and that the US Department of Defense (DoD) has not fully defined requirements for an engine cooling system upgrade.

The USD13.4 billion increase is because of greater acquisition costs, the GAO wrote. “The programme attributes the increased procurement cost to additional years of costs related to airframe and engine production, along with support costs for equipment, technical data, and training,” the GAO wrote. “According to programme officials, the programme is deferring the delivery of these 215 aircraft to later years at the request of the air force.” F-35 development costs have increased by a total of USD21.1 billion between 2012 and 2021, the GAO found. The programme's total 77-year lifespan cost now hovers around USD1.7 trillion.

A US triservice formation of the US Air Force F-35A (lead), the US Marine Corps F-35B, and the US Navy F-35C. (US Air Force)

On 30 May the US Government Accountability Office (GAO) released a report about the Lockheed Martin F-35, finding that the programme has not adequately explained a cost increase of USD13.4 billion since 2019, that the upgraded Block 4 version has run into technical snags and a USD1 billion cost increase, and that the US Department of Defense (DoD) has not fully defined requirements for an engine cooling system upgrade.

The USD13.4 billion increase is because of greater acquisition costs, the GAO wrote. “The programme attributes the increased procurement cost to additional years of costs related to airframe and engine production, along with support costs for equipment, technical data, and training,” the GAO wrote. “According to programme officials, the programme is deferring the delivery of these 215 aircraft to later years at the request of the air force.” F-35 development costs have increased by a total of USD21.1 billion between 2012 and 2021, the GAO found. The programme's total 77-year lifespan cost now hovers around USD1.7 trillion.

A US triservice formation of the US Air Force F-35A (lead), the US Marine Corps F-35B, and the US Navy F-35C. (US Air Force)

On 30 May the US Government Accountability Office (GAO) released a report about the Lockheed Martin F-35, finding that the programme has not adequately explained a cost increase of USD13.4 billion since 2019, that the upgraded Block 4 version has run into technical snags and a USD1 billion cost increase, and that the US Department of Defense (DoD) has not fully defined requirements for an engine cooling system upgrade.

The USD13.4 billion increase is because of greater acquisition costs, the GAO wrote. “The programme attributes the increased procurement cost to additional years of costs related to airframe and engine production, along with support costs for equipment, technical data, and training,” the GAO wrote. “According to programme officials, the programme is deferring the delivery of these 215 aircraft to later years at the request of the air force.” F-35 development costs have increased by a total of USD21.1 billion between 2012 and 2021, the GAO found. The programme's total 77-year lifespan cost now hovers around USD1.7 trillion.

A US triservice formation of the US Air Force F-35A (lead), the US Marine Corps F-35B, and the US Navy F-35C. (US Air Force)

On 30 May the US Government Accountability Office (GAO) released a report about the Lockheed Martin F-35, finding that the programme has not adequately explained a cost increase of USD13.4 billion since 2019, that the upgraded Block 4 version has run into technical snags and a USD1 billion cost increase, and that the US Department of Defense (DoD) has not fully defined requirements for an engine cooling system upgrade.

The USD13.4 billion increase is because of greater acquisition costs, the GAO wrote. “The programme attributes the increased procurement cost to additional years of costs related to airframe and engine production, along with support costs for equipment, technical data, and training,” the GAO wrote. “According to programme officials, the programme is deferring the delivery of these 215 aircraft to later years at the request of the air force.” F-35 development costs have increased by a total of USD21.1 billion between 2012 and 2021, the GAO found. The programme's total 77-year lifespan cost now hovers around USD1.7 trillion.