(Bloomberg) -- China is considering placing an order for hundreds of Airbus SE aircraft as soon as next month, when European leaders visit Beijing to celebrate the countries’ long-term ties, according to people familiar with the matter.

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Deliberations are underway with Chinese airlines about the size of a potential order, said the people, who asked not to be named discussing confidential matters. A deal could involve about 300 planes and include both narrowbody and widebody models, they said, with one person saying the order could range between 200 and as many as 500 aircraft.

Negotiations are fluid and could fall apart or take longer to reach a conclusion, the people said. Airbus declined to comment. Representatives for the Civil Aviation Administration of China didn’t respond to a faxed request for comment.

The European planemaker rose as much as 4.1% in Paris trading. Rolls-Royce Holdings Plc, which makes engines for Airbus widebody aircraft, rose as much as 0.7% in London.

Airbus has steadily increased its share of sales to China, helped by a final assembly line in Tianjin for its popular A320 family aircraft. A deal of the magnitude being discussed would help cement the European planemaker’s dominance in one of the world’s top aviation markets.

For its US rival Boeing Co., doing business in China has become more difficult as the company gets caught up in President Donald Trump’s trade war with Beijing. On Wednesday, Trump said in a social media post that Chinese leader Xi Jinping was very tough to make a deal with, raising doubts about the two largest economies reconciling their trade interests.

A high-profile deal with Airbus would allow Xi to send a message to Trump over trade. French President Emmanuel Macron and Chancellor Friedrich Merz of Germany are among leaders that may visit Beijing in July to mark 50 years of diplomatic relations between China and the European Union. Their countries are the two biggest shareholders in Airbus.

China and the US are at loggerheads over trade rules that Trump is determined to reset during his second presidential term. Should the two sides resolve their differences, Boeing could potentially win big — the US planemaker is America’s biggest exporter and a jet sale was featured in a US-UK trade deal in May.