Spending Intelligence · Major Acquisition Programs
The F-35: The Most Expensive Weapon System Ever Built
What began as a promise of an affordable joint strike fighter — one aircraft to replace many — became a ~$2.1 trillion, ~94-year program that has never hit its mission capable rate target. Every number on this page is sourced to a public government record.
Sources: GAO-22-105995 (F-35 Sustainment) · DoD SAR FY2023 · CBO F-35 analyses · POGO F-35 tracker · DoD Comptroller
Total Acquisition Cost
$400B+
FY2023 SAR: $398.6B for 2,456 aircraft
~94-Year Lifecycle Cost
~$2.1T
Acquisition + sustainment; DoD FY2023 MSAR / GAO-24-106703
Cost Per Flight Hour (F-35A)
$44K
FY2022 actual; GAO-22-105995
Best Actual MC Rate vs. Target
<65%
Fleet-wide; target has never been met; GAO data
Section 01
What the Program Is
Program Origin
The F-35 Lightning II began as the Joint Strike Fighter (JSF) program in 1996 — an effort to develop a single affordable fifth-generation multi-role aircraft that could replace the Air Force's F-16 and A-10, the Navy's F/A-18, and the Marine Corps' AV-8B Harrier. The theory was that shared development costs across three variants and multiple partner nations would make a cutting-edge stealth aircraft affordable. Lockheed Martin won the JSF contract in October 2001 over Boeing.
F-35A
Conventional Takeoff & Landing
Air Force; international partners
Primary production variant; cheapest of the three; single-engine; internal weapons bay
F-35B
Short Takeoff / Vertical Landing (STOVL)
Marine Corps; UK Royal Air Force/Navy; Italy
Lift fan replaces some fuel/weapons capacity; most complex variant; most expensive to develop; triggered weight-growth crisis
F-35C
Carrier-Variant
Navy; Marine Corps
Larger wing for carrier approach; reinforced airframe; folding wingtips; lowest production volume of the three
Section 02
The Cost Growth: How $233 Billion Became $400 Billion
All figures from DoD Selected Acquisition Reports (SARs) and DoD Comptroller documentation. Then-year dollars unless noted.
Unit Cost
~$81M
Quantity
2,866
Total Estimate
$233B
Original estimate at contract award to Lockheed Martin. DoD Comptroller baseline.
Unit Cost
~$112M
Quantity
2,852
Total Estimate
$302B
Weight growth in F-35B STOVL variant triggered first major cost review. DoD SAR.
Unit Cost
~$137M
Quantity
2,457
Total Estimate
$391B
Program triggered Nunn-McCurdy critical breach threshold — cost growth exceeded 25% over original baseline. Required congressional notification and DoD Secretary certification. Restructure completed 2011.
Unit Cost
~$162M
Quantity
2,456
Total Estimate
$398.6B
FY2023 Selected Acquisition Report (SAR). 66% unit cost increase; 17% quantity reduction from original contract.
Primary Cost Growth Drivers (DoD Comptroller / GAO Analysis)
Production began before development testing was complete. When testing found defects — and it always does — aircraft already built had to be retrofitted. Retrofit costs are government liability. DoD's own studies estimated concurrency added billions to the program. The decision to accept concurrency was driven by schedule pressure; the cost was paid by the taxpayer.
8.6 million lines of code in the ALIS/ODIN logistics system alone — not counting flight control, mission systems, or weapon integration software. Block 3F software, representing final developmental capability, was repeatedly delayed, pushing out operational testing and delaying full program transition. Each software delay added sustainment cost for aircraft that could not be fully employed.
The STOVL variant suffered severe weight growth early in development. The lift fan system and structural reinforcements required to support vertical landing added mass that exceeded original design margins. Fixing the weight problem required a structural redesign that cost years and hundreds of millions. This single-variant crisis drove costs across the entire program, as shared development resources were redirected.
As unit costs grew, some partner nations reduced their orders. Each reduction cut production volume and raised the unit cost for remaining buyers — the classic procurement spiral. The Netherlands reducing from 85 to 52 aircraft, Canada delaying its decision by 20 years, and other partners trimming orders compounded the underlying cost trend.
Section 03
The Readiness Problem: Targets Set, Targets Missed
Mission Capable (MC) rate is the percentage of the fleet able to perform at least one assigned mission at any given time. Source: GAO annual F-35 assessments.
Parts Availability
The F-35 supply chain was not designed for the operational tempo the fleet is flying. Parts that wear out faster than predicted — engine components, canopy seals, structural fasteners — take weeks or months to procure. When an aircraft is waiting for a part, it counts against MC rate. The ODIN logistics system is supposed to predict demand; the supply chain is supposed to have parts ready. Neither has consistently worked as designed.
F135 Engine Durability
The Pratt & Whitney F135 engine has faced durability issues in sustained operations, particularly at higher power settings used in combat maneuvering training. Hot-section components have required earlier-than-projected replacement. Depot repair capacity for F135 engines has lagged demand — aircraft sit waiting for engine overhaul. This is the intersection of sole-source dependency and real-world operational wear.
ALIS / ODIN Failures
When ALIS — the maintenance management system — gave incorrect maintenance directions, produced erroneous parts orders, or simply crashed, maintainers had to work around it. Aircraft that ALIS incorrectly flagged as non-mission capable still showed in reported statistics as non-MC. The transition to ODIN has improved reliability, but did not eliminate the category of ALIS-caused readiness failures.
The Readiness-Sustainment Connection
The most direct operational consequence is simple: when aircraft cannot fly, pilots cannot build the proficiency that makes the F-35's capabilities meaningful. Sensor fusion and stealth are only relevant if crews are proficient enough to use them. Below-target MC rates translate directly to reduced training sorties, which translates to reduced crew proficiency. Source: GAO-22-105995, Section III.
Section 04
The Sustainment Lock-In: Why $1.7 Trillion Is Not Optional
The acquisition cost is what you pay to buy the aircraft. The lifecycle cost is what you pay because you've already bought them and have no exit.
F135 Engine — Sole Source
The Pratt & Whitney F135 is the only engine the F-35 can fly. P&W controls all replacement parts, all depot-level maintenance, and all engine upgrade development. DoD has no competitive alternative for engine sustainment. The NDAA FY2023 directed DoD to pursue the Adaptive Engine Transition Program (AETP) — an alternative engine development program estimated to cost $6–10B. The argument: competition would reduce sustainment costs enough to justify development expense. The counter: the F135 is already designed in; retrofitting a new engine into existing airframes is technically complex.
ALIS / ODIN — Proprietary Logistics Data
The Autonomic Logistics Information System (ALIS) — replaced by the Operational Data Integrated Network (ODIN) — is the software backbone that schedules maintenance, tracks parts, and manages flight records. Lockheed Martin owns the underlying technical data and architecture. DoD does not have the data rights to operate, modify, or migrate this system without Lockheed's involvement. ODIN cost $1.4B+ to develop and addressed some ALIS failures, but the proprietary data rights structure is unchanged. Every aircraft that cannot fly because the maintenance system is wrong is a direct consequence of this dependency.
Performance-Based Logistics — The Perverse Incentive
DoD pays Lockheed Martin under a Performance-Based Logistics (PBL) contract structure — DoD pays for aircraft availability, not parts cost. Theoretically this incentivizes the contractor to keep aircraft flying. In practice: Lockheed controls the supply chain, the parts pipeline, and the repair data. When aircraft go down for sustainment reasons, Lockheed still captures revenue while DoD absorbs the readiness hit. The GAO has noted that PBL contracts in programs where the contractor has monopoly data rights create limited incentive structures. Source: GAO-22-105995.
Tech Data Rights Battle
Since 2019, DoD has been negotiating to acquire organic repair capability — the ability for government depots to fix F-35s without contractor involvement. Lockheed has resisted transferring technical data. The FY2020 and FY2021 NDAAs both directed DoD to report on tech data rights negotiations. As of FY2023, DoD has acquired limited organic repair rights for some components. Full organic depot capability remains a multi-year goal, not a current reality.
AETP: The Alternative Engine Play
The Adaptive Engine Transition Program (AETP) — developed by GE Aerospace — is the leading alternative engine candidate. The NDAA FY2023 directed DoD to study competitive engine acquisition. AETP proponents argue it would deliver better fuel efficiency and lower per-flight-hour costs. Opponents note the retrofit cost to install a new engine in existing F-35 airframes would consume much of the projected savings. As of FY2024, the debate is unresolved; DoD has not committed to engine competition funding.
Section 05
The Partner Nation Problem: The Procurement Spiral
Eight partner nations contributed development funding expecting shared unit costs. As costs grew, some reduced orders. Each reduction raised unit costs for remaining buyers. Canada delayed a final decision for nearly 20 years.
Largest buyer; sets unit cost floor for all partners
Reduced from initial planning figures; carrier operations
Full order maintained
Reduced from original planning of 85; cost growth driver
Production line partnership in Cameri; orders reduced from initial scope
Full replacement of aging F-16 fleet
Reduced acquisition; replacing F-16
Largest non-US buyer; assembly in Nagoya; significant partner investment
First tranche; additional procurement under consideration
Decision delayed approximately 20 years; contract finally signed 2023
Modified variant with Israeli systems integration
STOVL variant for constrained basing environment
The Spiral Explained
Unit cost in any production program decreases as quantity increases — economies of scale. The F-35 program was designed around large-quantity production amortizing high development costs. When cost growth scared off buyers, reduced quantity raised unit costs further, which scared off more buyers. The program's own cost behavior made itself less affordable. Each partner nation that reduced orders was individually rational; collectively, they accelerated the cost growth they were trying to avoid.
Section 06
What's Actually Working
Accountability requires acknowledging genuine performance. The F-35 program has management failures that are well-documented. It has also produced operationally real capabilities. Both are true.
Block 4 Capability Upgrades
Block 4 software and hardware upgrades are delivering advanced sensor fusion, expanded radar modes, new weapons compatibility (including the B61-12 nuclear gravity bomb for NATO mission compliance), and improved electronic warfare performance. These capabilities represent genuine operational advancement over legacy platforms.
F-35A Full Operational Capability
The F-35A achieved initial operational capability (IOC) in 2016 and full operational capability in 2023. Air Force F-35A units have deployed to Europe and the Indo-Pacific. In exercises, the sensor fusion and stealth combination have performed well against legacy fourth-generation threats in red/blue wargaming.
F-35B Marine Expeditionary Operations
The Marine Corps F-35B has demonstrated genuine STOVL utility in expeditionary operations — operating from amphibious assault ships, forward-deployed austere strips, and land bases without traditional runway infrastructure. This operational flexibility was a core program requirement and it works.
International Production Partnerships
The Cameri production line in Italy has matured and produces aircraft for Italian and other European customers. Japan's Nagoya facility assembles F-35s for the Japan Air Self-Defense Force. These partnerships distribute maintenance and production capacity geographically, reducing single-point-of-failure risk for allied force structure.
Sensor Fusion Is Genuinely New
The F-35's Distributed Aperture System (DAS) and Electro-Optical Targeting System (EOTS), combined with the AN/APG-81 AESA radar, create a sensor fusion picture that no fourth-generation aircraft can replicate. The ability to build and share a common operating picture across multiple F-35s in a formation represents a real leap in combat situational awareness.
The Operational Angle
What This Means For the People Who Fly and Maintain It
Maintainers are doing more with less
When MC rates fall below target, the aircraft that are flyable fly more. Higher utilization accelerates wear on already-stressed components. The maintainers absorb the operational tempo of a full fleet while keeping a partial fleet airworthy. The per-aircraft maintenance burden increases as fleet availability decreases.
Pilots are getting fewer training sorties
A below-target MC rate means fewer aircraft are available to fly. Fewer available aircraft means fewer sorties. Fewer sorties means pilots build proficiency more slowly. The F-35's most demanding combat tasks — electronic warfare, sensor fusion management, SEAD/DEAD integration — require repetitive practice. Less practice means less capability when it matters.
The $44K per flight hour has a unit-readiness dimension
At $44,000 per flight hour for the F-35A (FY2022), squadrons flying below-target rates spend less total on operations — but the per-sortie cost is fixed regardless of how many sorties fly. A squadron that can't fly its full schedule still owns the fixed infrastructure, the contracted support, and the personnel costs. Readiness shortfalls don't reduce sustainment costs proportionally.
ODIN failures have direct operational consequences
When the logistics system misidentifies a part, orders the wrong component, or incorrectly records a maintenance action, maintainers must manually diagnose and correct the record. That takes time that would otherwise go to fixing aircraft. At a deployed location with limited personnel, a bad ODIN record can ground an aircraft for days waiting for a part that's already on the shelf — in the wrong warehouse.
Frequently Asked Questions
How much does each F-35 actually cost?
Unit cost depends on variant and how you count. The FY2023 SAR reports a program acquisition unit cost of approximately $162M per aircraft in then-year dollars — this includes R&D costs amortized across the fleet. The "flyaway" cost (aircraft only, no R&D) is lower: roughly $82M for the F-35A in recent lots. The lifecycle cost — acquisition plus approximately 94 years of operation and sustainment — is projected at approximately $2.1T across the full fleet, per DoD FY2023 MSAR and GAO-24-106703. The $44,000 per flight hour figure is the FY2022 F-35A cost per flying hour, per GAO-22-105995.
What is a mission capable rate and why does it matter?
Mission Capable (MC) rate is the percentage of aircraft in the fleet that can perform at least one assigned mission at any given time. An aircraft is NOT mission capable if it is undergoing scheduled or unscheduled maintenance, waiting for parts, or has known defects that prevent flight. The F-35 program has set MC rate targets and then repeatedly failed to meet them. When an aircraft cannot fly, it cannot deter adversaries, cannot train pilots, and cannot support operational plans. The gap between the target rate and the actual rate represents the operational shortfall the fleet lives with every day.
What is the Nunn-McCurdy Act and how did the F-35 trigger it?
The Nunn-McCurdy Act requires notification to Congress when a major defense acquisition program's unit cost grows more than 15% above the current baseline (a "significant" breach) or more than 25% above the original baseline (a "critical" breach). A critical breach requires the Defense Secretary to certify that the program is essential to national security before it can continue. The F-35 triggered a critical Nunn-McCurdy breach in 2010 after cost growth exceeded 25% over the original acquisition program baseline. DoD certified the program as essential and completed a restructure in 2011.
What is ALIS and why was it a problem?
The Autonomic Logistics Information System (ALIS) was the software platform meant to manage all F-35 maintenance scheduling, parts tracking, and flight records. It was chronically unreliable — suffering from data corruption, slow performance, incorrect parts ordering, and security vulnerabilities. Pilots and maintainers routinely described working around ALIS rather than with it. DoD spent $1.4B+ developing ODIN (Operational Data Integrated Network) as a replacement. ODIN has addressed some ALIS deficiencies, but the fundamental problem — Lockheed Martin owns the tech data — remains.
Why didn't the fixed-price contract work to control costs?
The F-35 was never on a fixed-price development contract — it used cost-plus contracting for most of its development phase, which reimburses the contractor for actual costs plus a fee. Fixed-price contracts were used for production lots, not development. The issue is that the program began production before development testing was complete (concurrency). When testing found defects, already-produced aircraft had to be retrofitted. Those retrofit costs were government liability, not Boeing or Lockheed liability. The concurrency decision — driven by schedule pressure — transferred the cost risk of developmental problems back to the taxpayer.
Is the F-35 actually a good aircraft?
The question conflates cost performance with operational performance. The F-35 is a costly program with serious management failures — that is documented. It is also, by most operational accounts, a genuinely capable fifth-generation aircraft. Its sensor fusion, stealth, and networking capabilities are real advantages over legacy platforms. The failure is not the aircraft's design — it is the acquisition strategy, concurrency decisions, sustainment structure, and cost escalation. A program can produce a capable aircraft and be a management disaster simultaneously. The F-35 is both.
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Sources and methodology: Mission capable rate data and sustainment cost analysis from GAO-22-105995, “F-35 Sustainment: DoD Needs to Cut Billions in Estimated Costs and Improve Reliability” (GAO, 2022). Program acquisition cost data from DoD Selected Acquisition Report (SAR), F-35 Joint Strike Fighter Program, FY2023. Lifecycle cost projection from DoD budget submission to Congress. Congressional Budget Office F-35 analyses available at cbo.gov. POGO F-35 tracker at pogo.org. Engine sustainment analysis from DoD Comptroller performance-based logistics documentation. Nunn-McCurdy breach documentation from DoD Comptroller MDAP reports. Partner nation order data from F-35 Joint Program Office public releases. All dollar figures in then-year dollars unless noted. Unit costs vary by lot and accounting methodology — consult primary SAR for official figures. This page reflects public record only. No non-public DoD information is cited.