Boeing's deal to sell at least 200 commercial jets to China is in danger of "falling apart" due to a dispute over the supply of engine parts and maintenance. The Chinese government has reportedly pushed hard for terms guaranteeing the long-term supply of engine parts and other services. The White House has pushed back against Beijing's negotiating pressure, claiming that post-sale maintenance was not part of the estimated $17 billion to $19 billion agreement reached in May. Although no formal deal was signed in Beijing, US President Donald Trump claimed the deal could eventually involve up to 750 aircraft, marking…