The global aircraft business sure is complex. Big companies are both suppliers and customers of each other. There are only two major competitors -- but one new one, backed by the Chinese government -- threatens to alter the structure of the industry. And aircraft are so expensive that financing is the critical fuel that keeps the industry going. Meanwhile, the global economic slowdown threatens to cut demand for air travel and slice that capital flow.

This complexity comes to mind in analyzing a General Electric Co. (NYSE: GE) threat to Boeing (NYSE: BA) -- which it leveled by placing a $750 million order for five aircraft -- with an option to buy 20 more -- with China's Commercial Aircraft Corporation of China (CACC). CACC was formed earlier this year through the merger of China's two state aircraft makers, AVIC I and AVIC. And the expansion does not stop there -- today China announced plans to acquire a foreign general aviation aircraft maker to "shore up its technology capabilities."

GE's CACC buy is hurting one of GE's biggest customers -- that's because GE Aviation sells billions worth of engines to Boeing. And GE's aircraft financing unit -- GE Capital Aviation Services -- is in competition with American International Group's (NYSE: AIG) aircraft financing unit, International Lease Finance Corp. -- which is one of Boeing's biggest customers.