What Boeing Makes and Where It Makes It

Boeing is the world's largest aerospace manufacturer by revenue. The company builds commercial airplanes (the 737, 777, and 787 families), military aircraft (the P-8 Poseidon, KC-46 tanker, and others), defense and space systems, and parts for other manufacturers. Most of these products are assembled at a handful of large facilities in the United States, with additional work done by suppliers across North America and globally.

The two largest Boeing assembly plants are in Washington State: one in Everett (north of Seattle) and one in Renton (south of Seattle). Everett builds the 747, 767, 777, and 787. Renton builds the 737, which is Boeing's highest-volume product. A third major facility in North Charleston, South Carolina, also assembles 787s. Boeing also operates manufacturing sites in St. Louis, Missouri (defense and space systems), Mesa, Arizona (aircraft modifications and maintenance), and smaller facilities elsewhere.

The actual supply chain extends far beyond these assembly plants. Boeing buys engines from General Electric, Rolls-Royce, and Pratt & Whitney. It sources fuselage sections, wings, landing gear, avionics, and thousands of other components from hundreds of suppliers. Some of these suppliers are large companies; others are small shops that make a single specialized part.

Key Takeaways

  • Boeing operates major assembly plants in Washington State (Everett and Renton), South Carolina (North Charleston), and Missouri (St. Louis), each focused on different product lines.
  • The 737 is Boeing's highest-volume commercial airplane, while the 787 is its newest wide-body jet and represents the company's most advanced manufacturing technology.
  • Boeing's supply chain includes hundreds of companies across the United States and internationally, from engine makers to small parts manufacturers.
  • Manufacturing timelines for a single airplane can stretch 12 to 18 months from the start of assembly to delivery, depending on the model and customization.
  • Quality control and regulatory compliance are central to Boeing's operations because aircraft must meet strict Federal Aviation Administration (FAA) standards before they can fly.

The 737: Boeing's Workhorse Airplane

The Boeing 737 first flew in 1967 and has been in continuous production ever since, making it the best-selling commercial jet in history. More than 10,000 have been delivered to airlines worldwide. The 737 comes in several versions: the older 737 Classic and 737 NG (Next Generation), and the newer 737 MAX, which entered service in 2017 after a lengthy development period.

The 737 is a narrow-body airplane, meaning it has a single aisle and typically seats 150 to 210 passengers depending on the version and airline configuration. It is designed for short- to medium-range flights, typically up to 3,500 nautical miles. Most commercial flights you take in North America are on a 737 or a competing Airbus A320.

The 737 MAX faced significant challenges after two fatal crashes in 2018 and 2019 led to a worldwide grounding. Boeing made design changes and the FAA lifted the grounding in late 2020, but the MAX's return to service was gradual. Production rates have fluctuated as Boeing worked through supply chain disruptions and quality control issues in the early 2020s.

The 787 Dreamliner: Advanced Manufacturing

The Boeing 787 Dreamliner represents a major shift in how Boeing manufactures airplanes. It first flew in 2009 and entered service in 2011. The 787 is a wide-body airplane, meaning it has two aisles and typically seats 242 to 330 passengers. It is designed for long-range international flights, often 14 to 18 hours or more.

The 787 uses composite materials (carbon fiber reinforced plastic) for much of its structure, rather than the aluminum used in older designs. Composites are lighter and stronger than aluminum, which makes the airplane more fuel-efficient. The 787 also features larger windows, higher cabin pressure, and better humidity control, all designed to reduce passenger fatigue on long flights.

Manufacturing the 787 is more complex than building a 737 because of the composite materials and the integration of new systems. Boeing assembles 787s in Everett, Washington, and North Charleston, South Carolina. The company also uses a global supply chain: fuselage sections are built in Japan, Italy, and South Carolina; wings come from Japan; and other major sections come from suppliers in Canada and elsewhere. These sections are then shipped to the final assembly line.

How Boeing Manages Quality and Regulatory Compliance

Every Boeing airplane must pass rigorous testing before it leaves the factory and before the FAA allows it to carry passengers. The FAA certifies each new airplane model before it can enter service, and the FAA also oversees Boeing's manufacturing processes to may support they meet federal standards.

Boeing has its own quality control teams at every stage of manufacturing. Inspectors check parts as they arrive from suppliers, monitor assembly work, and conduct final inspections before delivery. The company also performs ground tests on each airplane: structural tests, system tests, and flight tests. A new 787, for example, undergoes months of testing before it is handed over to an airline.

In recent years, Boeing has faced public scrutiny over quality control. In 2023 and 2024, the FAA and Boeing identified manufacturing defects in 737 MAX and 787 airplanes, including loose fasteners, incomplete welds, and other issues. These discoveries led to increased FAA oversight, additional inspections, and changes to Boeing's manufacturing procedures. The company has stated that quality is its top priority and has made organizational changes to strengthen its quality systems.

Boeing's Supply Chain and Supplier Network

Boeing does not make every part of an airplane itself. The company relies on a network of suppliers that ranges from large aerospace companies to small specialized manufacturers. Major suppliers include Spirit AeroSystems (fuselage sections), Safran (landing gear and other systems), Honeywell (avionics and systems), and Collins Aerospace (cabin systems and components).

The supply chain is global. For example, the 787's fuselage sections are built in Japan by Mitsubishi Heavy Industries and in Italy by Leonardo. Wings come from Japan. Engines come from General Electric, Rolls-Royce, or Pratt & Whitney, depending on the airline's choice. This global approach allows Boeing to tap specialized informed and manufacturing capacity around the world, but it also creates complexity in coordinating parts, managing quality, and handling disruptions.

Supply chain disruptions have been a significant challenge for Boeing in recent years. The COVID-19 pandemic slowed production at suppliers and at Boeing's own facilities. Shortages of semiconductors and other materials have also affected the aerospace industry. In 2023 and 2024, Boeing reduced production rates for the 737 and 787 as it worked through quality issues and supply chain constraints.

Defense and Space Systems: Boeing's Other Major Business

Beyond commercial airplanes, Boeing is a major defense contractor. The company builds military aircraft including the P-8 Poseidon (a maritime patrol plane), the KC-46 Pegasus (a military refueling tanker), and the AH-64 Apache helicopter (in partnership with others). Boeing also manufactures missiles, satellite systems, and other defense electronics.

Boeing's defense and space division operates primarily from facilities in St. Louis, Missouri; Long Beach, California; and other locations. This business is separate from commercial airplane manufacturing in terms of facilities, supply chains, and regulatory oversight. Defense contracts are subject to different rules and security requirements than commercial airplane sales.

The defense business is also more stable in some ways because contracts are often long-term and government-backed, but it faces its own challenges. The KC-46 tanker program, for example, experienced significant delays and cost overruns before the first aircraft entered service in 2019. Boeing continues to deliver KC-46s to the U.S. Air Force, though the program has faced technical issues that required fixes.

Manufacturing Timelines and Delivery

Building a commercial airplane is a lengthy process. From the moment a customer (an airline) places an order to the moment the airplane is delivered, typically 12 to 18 months pass for a 737, and 18 to 24 months or more for a 787. This timeline includes design customization, parts procurement, assembly, testing, and regulatory approval.

The actual assembly of an airplane at the factory takes several months. A 737 might spend 8 to 12 weeks on the assembly line, while a 787 might spend 12 to 16 weeks or longer. During this time, sections are joined together, systems are installed and tested, and the airplane is gradually completed. Once assembly is done, the airplane undergoes final inspections and test flights before delivery.

Delivery is not the end of Boeing's involvement. The company provides training to the airline's pilots and maintenance staff, delivers spare parts, and offers ongoing technical support. Airlines also purchase maintenance contracts and support agreements from Boeing, which generate revenue long after the airplane is delivered.

Frequently Asked Questions

Where are Boeing airplanes assembled?

The main assembly plants are in Everett and Renton, Washington (commercial airplanes), and North Charleston, South Carolina (787s). Boeing also has facilities in St. Louis, Missouri (defense and space), and Mesa, Arizona (modifications and maintenance). However, major components come from suppliers worldwide, including Japan, Italy, Canada, and other countries.

How long does it take to build a Boeing airplane?

From order to delivery typically takes 12 to 24 months, depending on the model and customization. The actual assembly at the factory takes 8 to 16 weeks. The timeline includes parts procurement, assembly, testing, and FAA approval before the airplane can be delivered to an airline.

What is the difference between the 737 and the 787?

The 737 is a narrow-body airplane designed for short- to medium-range flights and seats 150 to 210 passengers. The 787 is a wide-body airplane designed for long-range international flights and seats 242 to 330 passengers. The 787 uses composite materials and advanced systems, making it more fuel-efficient and comfortable but also more complex to manufacture.

Why does Boeing use suppliers from other countries?

Boeing uses global suppliers to access specialized informed, manufacturing capacity, and cost advantages. For example, Japanese companies have advanced composite manufacturing capabilities needed for the 787. Global sourcing also allows Boeing to spread risk and tap the best suppliers for each component, though it adds complexity to managing quality and coordinating delivery.

How does the FAA oversee Boeing's manufacturing?

The FAA certifies each new airplane model before it can carry passengers and oversees Boeing's manufacturing processes to may support they meet federal safety standards. The FAA conducts inspections, reviews quality control procedures, and must approve any changes to the design or manufacturing process. Recent quality issues have led to increased FAA oversight of Boeing's operations.