The WTO said on Monday it had upheld the bulk of a ruling that Boeing received billions of dollars of subsidies to compete with Airbus, as both sides once again claimed victory in a long-running trade row.

The unfair subsidies included at least USD$2.6 billion in assistance from space agency NASA, which the World Trade Organization's appellate body agreed had allowed the US company to launch its 787 Dreamliner and caused "serious prejudice" to Airbus.

The WTO has already ruled that Airbus received illegal aid through a system of European government loans but the two sides cannot agree on the scope or impact of that ruling.

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