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Boeing’s best-selling 737 airliner just celebrated 55 years of production. See inside the factory where the plane is built.

Taylor Rains/Insider

  • Boeing just celebrated 55 years of its 737 program, which is produced at its Renton, Washington factory.
  • The facility has been building planes for 80 years, starting with tankers and bombers but now produces the 737 MAX.
  • Insider toured the factory to learn more about the production and history of the best-selling 737. 

This year marks the 80th anniversary of Boeing’s Renton factory in Washington state and 55 years of the planemaker’s 737 program.Boeing 737 factory in Renton, Washington.Boeing 737 factory in Renton, Washington.

JASON REDMOND/AFP via Getty Images

Source: Boeing

Production at the 1.1 million-square-foot factory started with tankers and bombers during World War II. The first-ever aircraft produced at Renton was the XPBB-1, and only one was built, giving it the nickname the “Lone Ranger.”Boeing XPBB-1 Sea Ranger Patrol Bomber.Boeing XPBB-1 Sea Ranger Patrol Bomber.

US Navy

Source: Boeing

Other famous military planes built at Renton include the Boeing B-29 Superfortress and the Boeing 367-80, nicknamed the “Dash 80.”B-29 SuperfortressA B-29 Superfortress.

US Defense Department

The Dash 80 led to the production of the first jet-powered tanker, the KC-135 Stratotanker…KC-135 Stratotanker.KC-135 Stratotanker.

Jon Hobley/MI News/NurPhoto via Getty Images

…and the Boeing 707 commercial airliner, which ushered in a new era of international travel.Boeing 707.The first 707 rolled off the assembly line at Renton in May 1954.

Boeing

About 30% of the world’s commercial jetliners, including the Boeing 707, 727, 737, and 757, were built at Renton — which is about 14,500 airplanes.Boeing Renton factory.Boeing 727 (left) and 737 (right) being built at Renton in 1977.

-/AFP via Getty Images

Source: Boeing

In 1967, the production of Boeing’s best-selling 737 began. The company built two “original” 737 models, including the -100 and -200…Boeing 737-100.Lufthansa Boeing 737-100 in 1968.

Museum of Flight/CORBIS/Corbis via Getty Images

Source: Boeing

…and three “classic” variants, including the -300, -400, and -500.Boeing 737-400.Boeing 737-400.

Fabrizio Gandolfo/SOPA Images/LightRocket via Getty Images

Source: Boeing

From 1997 to 2019, Renton built Boeing’s Next Generation 737 aircraft: the -600, -700, -800, and -900.Southwest Airlines.

Jonathan Weiss/Shutterstock

Source: Boeing

Boeing’s fourth-generation plane, the 737 MAX passenger jet, began production in 2015 at Renton. Three models — the MAX 8, MAX 9, and MAX 8200 — are currently in service with airlines around the world.Boeing 737 MAX 8, 8200, and 9 aircraft.A lineup of Boeing 737 MAX aircraft (Alaska -9, Ryanair -8200, and Southwest -8).

Taylor Rains/Insider

Source: Boeing

However, the MAX program proved to have problems, with two planes crashing due to a software design flaw that led to a worldwide grounding of the jet.Ethiopian Airlines' 737 MAX crashed in 2019.An Ethiopian Airlines’ 737 MAX crashed in 2019. Indonesian carrier Lion Air’s MAX crashed in 2018.

Skycolors/Shutterstock

Source: Insider

The fallout of the tragedies, which killed 346 people, forced Boeing to reengineer its stall prevention system.China Southern Boeing 737 MAX 8.China Southern Boeing 737 MAX 8.

aapsky/Shutterstock

Since the Federal Aviation Administration signed off on the plane’s airworthiness in November 2020, airlines have started flying them again.WestJet Boeing 737 MAX 8WestJet Boeing 737 MAX 8

Joel Serre/Shutterstock

Boeing is also continuing the development of the 737 MAX 7 and 10, which are awaiting certification.Boeing 737 MAX 10.Boeing 737 MAX 10.

Taylor Rains/Insider

Source: Boeing

Insider toured the factory to see the 737 MAX final assembly line and learn about the process — take a look.Boeing 737 factory tour.

Taylor Rains/Insider

The tour was led by Dennis Eng, Boeing’s director of 737 program business operations. He explained the factory is split into three assembly lines — east, west, and center.Boeing 737 factory tour.

Taylor Rains/Insider

Currently, the west and center lines are active, and Boeing plans to activate the east side once it has enough personnel.Boeing 737 factory tour.

Taylor Rains/Insider

While Eng did not specify what the current monthly MAX output is, he said Boeing’s goal is to produce 31 planes per month.Boeing 737 factory tour.

Taylor Rains/Insider

Walking through the factory, Eng said the planes go through 10 different flow days during final assembly, which includes things like hydraulic, wiring, and systems installation, joining the wings to the fuselage, installing the interior, and testing.Boeing 737 factory tour.

Taylor Rains/Insider

The fuselage comes complete from Wichita, Kansas, and is built by Spirit AeroSystems. It is then transported via rail to Renton where it is joined to the wings.Boeing 737 factory tour.

Seattle Times

To join the body is a complicated process, according to Eng, who said workers use cranes and other tools to move parts around the massive building.Boeing 737 factory tour.Cranes on the ceiling of the Renton factory.

Taylor Rains/Insider

Because of the complexities, the movements are done during one of the three shifts employees work.Boeing 737 factory tour.

Seattle Times

When installing economy class seats, Boeing uses a modified hay bail. This process is done during the first shift and completed while the fuselage is still open in the back to make it easier.Boeing 737 factory tour.

Taylor Rains/Insider

The planes had their engines and landing gear by the last flow.Boeing 737 factory tour.

Taylor Rains/Insider

After final assembly, the jets will complete flight testing out of Boeing Field, be painted in their respective livery, and delivered to their final owner.Boeing 737 factory tour.

Taylor Rains/Insider

Eng explained Boeing has reimagined its Renton factory over the years to create more efficient processes. Specifically, the planemaker has developed a system that better stages parts to ensure employees have the exact tools they need for each flow.Boeing 737 factory tour.Some of the tool kits.

Taylor Rains/Insider

This is done by assembling flow-specific kits that are positioned at each station. This eliminates the need for workers to walk back and forth between the plane and the tool room during shifts.Boeing 737 factory tour.Some of the tool kits.

Taylor Rains/Insider

The system improves quality and safety and decreases plane damage, according to Boeing.Boeing 737 factory tour.

Taylor Rains/Insider

We saw a few completed 737 planes at the factory, including Southwest Airlines, Alaska Airlines, and a United MAX 10, which Eng said is a test aircraft. It is rare to see the -10 in a completed livery.Boeing 737 factory tour.The United-painted 737 MAX 10.

Taylor Rains/Insider

During our grand tour of Boeing factories, Insider also spent time in Everett where the manufacturer is building cargo planes and other passenger jets, like the 777 and 787.Boeing 777 factory tour.Boeing 777 aircraft.

Taylor Rains/Insider

There were several seemingly complete 787 aircraft in the factory, but Boeing has been unable to deliver the jet since May 2021 due to safety concerns from the Federal Aviation Administration regarding gaps between fuselage sections.Boeing 787 factory tour.Boeing 787 aircraft.

Taylor Rains/Insider

Boeing submitted incomplete documents for its grounded $12.5 billion 787 Dreamliner jets, authorities say

As a special treat, we also saw one of the last 747 planes ever to be built, which is a 747-8F going to cargo carrier Atlas Air. The airline has three on order, which will all be delivered by the end of 2022.Boeing 747 Factory Tour.Boeing 747 Factory Tour.

Seattle Times

Boeing’s iconic 747 will leave the assembly line for the last time this year. See one of last jumbo jets the planemaker will ever build.

The completion of the final three jets will mark the end of a 54-year era that revolutionized air travel by making international flights affordable for the first time.Boeing 747 Factory Tour.Boeing 747 Factory Tour.

Taylor Rains/Insider

More airlines are choosing single-aisle jets for flights from North America to Europe — see the full evolution of jet-powered transatlantic flying

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