 Boeing is not the only company in the aviation industry that's lost a lot of experience on the shop floor. So has Spirit Aerosystems, the key supplier that builds the fuselage for the 737 in Wichita, Kansas. Boeing is in talks to buy most of Spirit, reacquiring the factory it sold off almost 20 years ago. The two companies have already made some changes aimed at cutting down on the number of production errors before the fuselages arrive at Boeing's factories.