China has risen as global economy in the last 20 years or so only. They did not have the resources earlier. Where as Boeing and now what is Airbus started from the earliest time of passenger aircraft in early 1930s-40s. To build everything needed to build passenger planes from the ground up would take resources that no one can match today. And even if they do because of regulatory blockades of USA and Europe no Airline would be willing to buy such an aircraft so civilian aircraft are hard to build even harder to sell. Where as military aircraft China will probably match US in the next decade or so.