US President Donald Trump speaks to members of the media on the South Lawn of the White House before boarding Marine One in Washington, DC, US, on Tuesday, May 12, 2026. Bonnie Cash | Bloomberg | Getty Images Prediction market traders think President Donald Trump will make some major announcements in his trip to meet with Chinese President Xi Jinping in Beijing.  Traders on Kalshi give an 86% chance that he will announce China will buy aircraft from domestic manufacturer Boeing .  That belief is shared with Wall Street, as Boeing's stock advanced nearly 2% on Wednesday ahead of the meeting.  "The speculation is that Trump wants this to be the largest order ever announced, which could mean a Boeing purchase commitment in the triple-digit billions," wrote Tobin Marcus, head of U.S. politics and policy at Wolfe Research, in a note.…