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The unanimous decision came as a surprise to aviation analysts, who had overwhelmingly anticipated a ruling in Boeing’s favour. Bombardier’s stock surged 19 per cent to $3.67 moments after the decision was made public, before paring some gains to close at $3.54.

On Monday the stock was trading up 17 per cent at $3.68.

The ruling also means that Bombardier can move ahead with the delivery of its CSeries jets to Delta, originally scheduled to begin in the spring.

“Today’s decision is a victory for innovation, competition and rule of law,” Bombardier said in a statement released shortly after the vote.

“The CSeries is the most innovative and efficient new aircraft in a generation. Its development and production represent thousands of jobs in the United States, Canada, and the United Kingdom…. With this matter behind us, we are moving full speed ahead with finalizing our partnership with Airbus.”

Boeing said in a statement it is disappointed with the decision and that the commission “did not recognize the harm that Boeing has suffered from the billions of dollars in illegal government subsidies that the Department of Commerce found Bombardier received and used to dump aircraft in the U.S. small single-aisle airplane market.”

The U.S.-based aerospace company said it will review the commission’s detailed opinions when they are released at a later date.

“Boeing remains confident in the facts of our case and will continue to document any harm to Boeing and our extensive U.S. supply chains that results from illegal subsidies and dumped pricing,” the company said in a statement.