Aviation and engineering fans will enjoy this look at how Boeing manages to build a 737 in just days at their aircraft factory in Renton, Washington. Technically, it does take more than nine days if you count the time to build the fuselage at the Boeing plant in Wichita, Kansas. I have flown on a 737 many times as it is the plane used by Southwest Airlines and I always felt completely safe on this aircraft. It’s amazing that this factory can build 42 of these planes a month.