- F-35 Block 4 upgrade delayed until at least 2031: GAO Breaking Defense
- Pentagon cuts back F-35 upgrades to slow schedule slips: Auditors Defense News
- GAO Report on the F-35 Joint Strike Fighter USNI News
- Lockheed, Pratt & Whitney Can’t Keep Up With F-35 Deliveries Law360
- F-35 Continues To Over-Promise, Under-Deliver, GAO Says In New Review Bloomberg.com
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