Just outside Seattle, Washington is the Boeing 737 production facility. This place makes about 40-ish planes a month, with each plane taking about 9 days on the assembly line at this facility to become a complete and functioning airplane. The whole process probably takes much longer than 9 days though because Boeing actually receives the fuselage pre-built from Kansas. Regardless, the amount of manpower and expertise required is still extraordinary. Watch this time-lapse that WIRED put together.