WTO says U.S. subsidized Boeing
The subsidies included banned support in the form of research and development aid from the NASA space agency.
The ruling by a panel of trade judges is the latest chapter in a six-year battle over state support for the industry's two giants in what has become the world's largest trade dispute.
A separate WTO trade panel condemned European support for Boeing rival Airbus in a parallel case last year.
(Reporting by Andrew Callus, Tim Hepher)