Here's an excellent clip from the PBS Newshour which shows how Boeing depends on the global market place to build its planes. (scroll to about 1:57 to start)
Boeing shows PBS economics reporter, Paul Solmon, a big table map with different parts of a Boeing plane from markets all over the world.
For example, the fuselage comes from Japan, the rudder from China, and the wheels come from Britain.
The advantage of so much outsourcing, according to IMF chief economist, Simon Johnson, is that those suppliers are likely to buy the completed plane.