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Patent portfolio assigned to ZeroAvia (verified via public assignee records). Estimated patent count: 45. UK/US hydrogen-electric aircraft powertrain developer. Customers/preorder partners (American, United, Alaska are conditional-purchase/option engine orders) listed on its own operators page; OEM partners Cessna, Dornier, De Havilland, plus KLM/Japan Airlines. has_patents=true, ~45 granted per ZeroAvia's own July 2025 press release (e.g. US20220336829A1, USPTO 12,341,225).