Zunum Aero vs. Boeing: Appeals Court Revives Stolen Trade Secrets Claim – What This Means for Aviation Innovation

The battle over aviation innovation is heating up again. In a significant development, the U.S. Court of Appeals for the Ninth Circuit has revived a trade secrets claim by Zunum Aero, a now-defunct hybrid-electric aircraft startup, against aerospace giant Boeing. This legal saga, Zunum Aero, Inc. v. The Boeing Company, highlights the critical importance of protecting intellectual property in the fiercely competitive aviation industry and raises important questions about fair competition and the future of aviation innovation.

A David and Goliath Story: Zunum Aero’s Rise and Fall

Zunum Aero, founded in 2013, aimed to revolutionize regional air travel with its hybrid-electric aircraft. The company garnered significant attention and financial backing, including investments from Boeing HorizonX and JetBlue Technology Ventures. Zunum’s vision was to develop a family of hybrid-electric regional aircraft capable of carrying up to 50 passengers, promising a more sustainable and cost-effective mode of air transportation.

However, Zunum’s journey was cut short. By 2019, the startup faced severe financial difficulties and ceased most of its operations, laying off its staff. Zunum alleged that Boeing undermined their operation in order to maintain its dominant position in commercial aviation by stifling competition. The company’s equipment is currently stored at leased facilities in Washington and Indiana. Despite the setback, Zunum has expressed its intent to continue and is actively fundraising for the next chapter of the company.

The Lawsuit: Allegations of Stolen Trade Secrets

In 2020, Zunum filed a lawsuit against Boeing, accusing the aerospace giant of a “targeted and coordinated campaign” to access Zunum’s proprietary information, intellectual property, and trade secrets. Zunum claimed that Boeing copied its plans, designs, and technologies for its own hybrid-electric aircraft, effectively stifling Zunum’s ability to compete. Boeing has denied the allegations, arguing that Zunum failed due to mismanagement and an unrealistic business plan. Boeing stated in court records that it developed a conceptual mock-up to evaluate the feasibility of Zunum’s hybrid electric aircraft and concluded that the proposed plane would not be economically feasible for commercial flight anytime soon.

The case went to trial in May 2024, and a Seattle jury sided with Zunum, awarding the startup over $81 million in damages for trade secret misappropriation, breach of contract, and tortious interference. The jury found that Boeing had misappropriated 11 of Zunum’s trade secrets and interfered with Zunum’s business expectancy with a potential investor, Safran.

However, this victory was short-lived. In August 2024, a federal judge overturned the jury’s decision, ruling that Zunum had failed to prove that Boeing misused its intellectual property. The judge found Zunum’s evidence speculative and insufficient to show any breach of contract or harm caused by Boeing.

Appeals Court Revives Zunum’s Claim

Now, the U.S. Court of Appeals for the Ninth Circuit has breathed new life into Zunum’s case. On August 14, 2025, the appeals court reversed the district court’s decision, reinstating the $81 million damages award against Boeing. The appeals court held that Zunum had presented substantial evidence to support the jury’s findings of misappropriation of trade secrets, breach of contract, and tortious interference. The panel found that Zunum had provided sufficient specificity for the jury to meaningfully evaluate whether the trade secrets were protectable, valuable, and used inappropriately by Boeing.

Furthermore, the appeals court revealed that the original judge in the case, Judge Robart, had failed to disclose that his wife purchased Boeing stock during the litigation. This has led the appeals court to order that the case be reassigned to a new judge on remand.

What This Means for Aviation Innovation

This legal battle has significant implications for aviation innovation:

Protection of Trade Secrets: The case underscores the importance of protecting trade secrets in the aviation industry. Trade secrets can include a wide range of confidential information, such as design specifications, manufacturing processes, technical data, and business strategies. Companies must take reasonable measures to maintain the secrecy of their trade secrets, such as limiting access to authorized personnel, using non-disclosure agreements (NDAs), encrypting digital files, and storing sensitive documents in secure locations.
Impact on Startups: The Zunum Aero case highlights the challenges faced by startups in the aviation industry when competing against established giants like Boeing. Startups often rely on their innovative technologies and trade secrets to gain a competitive edge. However, they may lack the resources to effectively protect their intellectual property and enforce their rights against larger companies.
Fair Competition: The case raises questions about fair competition and the potential for larger companies to stifle innovation by misappropriating the trade secrets of smaller competitors. The legal system plays a crucial role in ensuring a level playing field and protecting the rights of innovators.
The Future of Hybrid-Electric Aircraft: Zunum Aero’s vision of hybrid-electric regional aircraft represents a promising path toward more sustainable and cost-effective air transportation. The outcome of this case could influence the future development and adoption of this technology.

Legal Considerations and Advice

Trade secret law protects confidential information that provides a business with a competitive edge. To qualify for trade secret protection, information must meet two main requirements:

Reasonable efforts to maintain secrecy: The owner of the trade secret must take reasonable steps to keep the information confidential.
Derivation of independent economic value from secrecy: The trade secret must derive its value from not being generally known or readily ascertainable.

Companies in the aviation industry should take proactive steps to protect their trade secrets, including:

Conducting a trade secret audit: Identify and document all valuable trade secrets.
Implementing security measures: Restrict access to trade secrets, use NDAs, and implement cybersecurity protocols.
Training employees: Educate employees on the importance of protecting trade secrets and the consequences of misappropriation.
Monitoring employee activity: Monitor employee access to trade secrets and investigate any suspicious activity.

If a company suspects that its trade secrets have been misappropriated, it should take immediate action, including:

Investigating the misappropriation: Determine the scope and nature of the misappropriation.
Sending a cease and desist letter: Demand that the misappropriating party stop using the trade secrets.
Filing a lawsuit: Seek injunctive relief and damages for the misappropriation.

The consequences of trade secret misappropriation can be severe, including civil liability for damages, unjust enrichment, and punitive damages, as well as criminal penalties under the Economic Espionage Act of 1996 (EEA).

Conclusion

The Zunum Aero vs. Boeing case is a complex legal battle with far-reaching implications for aviation innovation. The appeals court’s decision to revive Zunum’s trade secrets claim underscores the importance of protecting intellectual property and ensuring fair competition in the aviation industry. As the case moves forward, it will be closely watched by companies, investors, and policymakers alike, as it could shape the future of aviation innovation for years to come.

Disclaimer: This blog post is for informational purposes only and does not constitute legal advice. If you have any questions about trade secret law or other legal matters, please consult with a qualified attorney.