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Boeing launches fourth 737 MAX final assembly line at Everett facility
Boeing opened a new 737 MAX final assembly line in Everett, Washington, expanding production beyond Renton for the first time in over five decades.
The gist
Boeing started production on a new 737 MAX line in Everett, boosting capacity and diversifying assembly beyond Renton.
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Boeing has inaugurated its fourth final assembly line for the 737 MAX at its Everett, Washington factory, marking a significant expansion of production facilities for the narrowbody aircraft. This development represents the first occasion in more than 50 years that 737s will be assembled outside the Renton plant near Seattle. Production commenced on July 6, 2026, with the first airplane rolled out being a 737 MAX 10 variant.
The new North Line is housed within the Everett factory space originally designed for widebody aircraft, including the iconic 747. By adapting existing infrastructure from Boeing's long history of widebody manufacturing, the company repurposed these areas to accommodate the 737 MAX assembly process. The inaugural aircraft on this line has not been publicly associated with a specific customer.
Operationally, the Everett line is configured around the same assembly methods employed at the three existing Renton production lines, about 40 miles to the south. Maintaining uniform procedures across both locations facilitates the sharing of best practices and production improvements between teams, which is expected to sustain quality and efficiency as output expands.
Despite the addition of the Everett line, Boeing does not anticipate an immediate jump in monthly 737 production. The first aircraft on the new line will serve as a low-rate initial production model, allowing workers to refine the line, complete regulatory compliance, and address any early-stage challenges before ramping up output.
Currently, Boeing is increasing the 737 monthly production rate from 42 to 47 aircraft. The plan is to stabilize this higher output level within Renton before leveraging the Everett production capacity to push the overall monthly rate up to 52 aircraft or more in the future. This staged growth strategy aims to ensure manufacturing stability as volumes increase.
Boeing's backlog for the 737 MAX program stands at over 4,000 units, ensuring steady demand well into the coming decade at current delivery rates. The added North Line provides essential capacity to meet this backlog while reducing reliance on the three Renton lines, all consolidated at a single facility.
Additionally, the Everett line is set up to handle more complex 737 configurations that require additional assembly time. These include aircraft with intricate interiors or extra modifications that would otherwise impact flow on the Renton lines. This flexibility helps Boeing better manage production efficiency and customization needs.
The decision to expand into Everett follows the factory's availability after the end of 747 production and the relocation of 787 final assembly to South Carolina. Everett continues to produce Boeing’s 767 and 777 widebodies alongside now the 737 MAX, utilizing its extensive manufacturing footprint.
This expansion comes as Boeing works to rebuild steady 737 output after several years of disruptions and FAA-imposed production limits following a 2024 incident involving a door plug separation on an Alaska Airlines 737 MAX 9. Boeing has gradually increased production rates while collaborating closely with regulators and suppliers, prioritizing manufacturing stability and quality.
The historical context highlights that the original 737s were built near Seattle before the program was shifted to Renton in 1970. The return of some 737 assembly to Everett represents a strategic diversification within Boeing’s production system, supporting resilience and capacity growth for the world's best-selling commercial aircraft.
Frequently asked questions
- Why did Boeing open a new 737 MAX assembly line in Everett?
- Boeing opened the Everett line to expand 737 MAX production capacity beyond Renton for the first time in decades, leveraging available space after 747 production ended and to help meet a large backlog of orders.
- How will the new Everett line affect Boeing’s 737 production rates?
- The Everett line will start with low-rate production to test and refine the process, then help increase total monthly output from the current 42-47 aircraft to possibly 52 or more once Renton stabilizes.
- What is the significance of assembling 737 MAX aircraft outside Renton?
- This is the first time in over 50 years that 737s are built outside Renton, diversifying Boeing’s production risk and increasing assembly capacity in the Everett factory, originally a widebody production site.
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Boeing launches 737 Max assembly at new Everett North Line to boost production
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