Boeing has started work of its 737 Commercial Delivery Centre (CDC) expansion that will more than double the space to more than 90,000 square feet.
The Seattle facility will include a new three-story building, as well as new delivery and departure areas with three covered jetways.
Boeing says plans are in place to ensure seamless deliveries to 737 customers during construction, which includes the demolition of one building. The CDC expansion is scheduled for completion in mid-2015.
Production of the 737 is set to increase to 42 airplanes per month in April and to 47 airplanes per month in 2017, an increase in output of nearly 50 percent since 2010.