Boeing is preparing to open a fourth 737 production line next month as it works toward building 42 single-aisle jets per month and eventually more. The move marks a significant shift in how the company uses its Washington facilities and is central to its effort to regain ground in the narrow-body market after years of disruption.
Located in Everett, the new line is intended to boost output of the 737 MAX family while Boeing continues to navigate regulatory scrutiny, supplier problems, and intense pressure from airline customers waiting for aircraft.
How Boeing’s 737 production plan is changing
Boeing has confirmed that a new 737 production line will begin operations in July, with the company’s chief executive calling the move a key step in its recovery strategy. In remarks describing the plan, the CEO said the additional line will support a production rate of about 42 aircraft per month as Boeing works through its backlog of MAX orders, according to a company feature on the new 737 line.
The line will be housed in Everett, where Boeing historically built wide-body jets such as the 747 and 787. Local business reporting describes how the company is repurposing part of the massive Everett factory for 737 work, with the line expected to start by midsummer and eventually support higher output once it is fully staffed and stabilized, according to coverage of the Everett 737 line.
Industry-focused outlets say the Everett line will begin with a modest number of aircraft and ramp up over several months. One report states that the line is scheduled to open on July 6 and is part of a path that could ultimately allow Boeing to reach a rate of 52 jets per month, once the company meets internal quality benchmarks and receives regulatory comfort with its processes, according to analysis of the fourth 737 line.
The expansion to a fourth line builds on Boeing’s existing 737 production system in Renton. The company has been working to stabilize three active lines there while dealing with supplier issues and quality problems that have periodically slowed deliveries. The Everett line is intended to add capacity without overloading the existing Renton operation, which remains the core hub for 737 assembly.
Why the new Everett line and 42-per-month goal matter now
The new production target follows a period in which Boeing struggled to maintain consistent output of the 737 MAX. Earlier this year, Boeing executives discussed a plan to raise the rate toward 47 aircraft per month once regulators were satisfied with quality improvements and the supply chain could support higher volumes. Reporting on those comments described a path in which the company would move from a lower rate to about 42 per month, then eventually to 47, as part of its recovery plan for the MAX program, according to analysis of the 737 production rate.
The decision to open another line is closely tied to commitments Boeing has made to airlines that are waiting for new single-aisle aircraft. Carriers in North America, Europe, and Asia have ordered hundreds of 737 MAX jets to replace older fleets and support growth. Many of those customers have already endured delivery delays linked to grounding orders, rework on completed aircraft, and disruptions in the supply of key components. Increasing capacity to 42 jets per month is intended to shorten wait times and reduce the risk of further schedule slippage.
Regulatory oversight of Boeing’s production system has also intensified. After high-profile incidents involving the 737 MAX and subsequent inspections, federal regulators have been closely monitoring how the company manages quality and safety on its assembly lines. Boeing executives have acknowledged that any move to increase rates must be coordinated with regulators and must follow evidence that process improvements are working as intended. The fourth line is therefore not just a capacity play but also a test of whether Boeing can scale up while maintaining the standards that regulators now expect.
The Everett line carries significant implications for the local workforce and industrial footprint in Washington state as well. The Everett factory had been facing questions about its long-term role as Boeing shifted some wide-body work elsewhere and wound down 747 production. By assigning 737 work to that site, the company is signaling that Everett will remain central to its narrow-body strategy, with new jobs and retraining opportunities for workers who previously focused on larger jets.
Financially, the ability to produce 42 or more 737s per month is critical to Boeing’s efforts to repair its balance sheet. The 737 MAX program is one of the company’s most important sources of cash, and higher, stable output can help offset costs tied to rework, compensation, and investments in safety improvements. Analysts have pointed out that each incremental step up in monthly production, once sustained, can translate into significant additional revenue and margin improvement, especially as Boeing works through a large backlog of relatively high-margin orders.
Operational pressures behind Boeing’s production shift
Boeing’s leadership has described the new Everett line as part of a broader restructuring of its narrow-body manufacturing system. In an interview outlining the company’s production strategy, the CEO discussed how the fourth line would give Boeing more flexibility to manage disruptions, such as supplier delays or quality findings, by allowing work to be shifted between lines when necessary. The executive also framed the move as a way to gradually climb toward the company’s long-term output ambitions, while keeping a close eye on safety and regulatory requirements, according to comments reported in coverage of the 737 assembly plan.
The company has had to manage not only structural concerns but also specific technical issues on the MAX program. In one instance, Boeing temporarily paused some 737 MAX deliveries after discovering wiring damage on a subset of aircraft, which required inspection and repair before the jets could be handed over to customers. That episode, described in reporting on the wiring damage, highlighted how even relatively contained problems can ripple through the delivery schedule when the production system is already running near its limits.
By adding capacity in Everett, Boeing aims to build more slack into the system so that unexpected rework or inspections on one line do not instantly translate into broader delays. The new line also allows the company to experiment with updated tooling, digital systems, and layout concepts that could later be applied across the rest of the 737 network. Industry coverage has suggested that Boeing is using the Everett site to test some process changes that are meant to simplify assembly steps and reduce the risk of errors, according to analysis of the Everett production plan.
There is also a strategic labor component. Opening a line in Everett gives Boeing access to a pool of experienced mechanics and engineers who have worked on other complex aircraft programs. The company can leverage that expertise while also spreading work more evenly between its major Puget Sound locations, which may help in future labor negotiations and planning for new programs.
What comes next as Boeing chases higher 737 output
In the near term, the key question is how quickly Boeing can bring the Everett line up to speed without triggering new quality or regulatory setbacks. The company has outlined a stepwise ramp, starting with a limited number of aircraft and gradually increasing as teams gain experience and metrics show stable performance. Analysts expect Boeing to hold the overall system near 42 jets per month until it is confident that both Renton and Everett can sustain higher rates.
