Decision IntelUS Department of Defense / Lockheed Martin
F-35 Joint Strike Fighter Cost Overruns
Estimated impact: $170B+ in cost overruns; 10+ year delays
Originally estimated at $233B for 2,866 aircraft, the F-35 program has grown to $400B+ with decade-long delays. Concurrency strategy (building aircraft while still in development) locked in design flaws.
Decision context
DoD adopted "concurrent development" to accelerate delivery, building production aircraft before testing was complete. Initial cost estimates were knowingly optimistic to secure congressional funding. Three service variants increased complexity exponentially.
Decision anatomy
Red = risk factor present · Green = protective factor present
Biases present in the decision
★ Primary driver · Severity estimated from bias type and decision outcome
Toxic combinations
The curated library this case sits in
Across all 155 curated case studies in our library, by documented outcome:
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Lessons learned
- Concurrent development creates massive sunk cost traps when defects are found late
- Multi-service requirement consolidation exponentially increases program risk
- Initial cost anchors in defense procurement systematically underestimate by 40-80%
Source: GAO Report GAO-21-105, "F-35 Joint Strike Fighter: DOD Needs to Update Modernization Schedule," 2021 (Post Mortem)
These patterns were flaggable in US Department of Defense / Lockheed Martin's own record — before the outcome.
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Workflows that fire on decisions like US Department of Defense / Lockheed Martin’s
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