Boeing Opens Fourth 737 Max Assembly Line

New ‘North Line’ at the historic Washington state factory marks a significant boost in production capacity for the aerospace giant.

Meg Godlewski

Monday, July 06, 2026 at 02:00 PM ET

Verified

Edited By:

Travis Tingle

Boeing factory in Everett, Washington [Credit: Boeing Future of Flight]

Key Takeaways:

Boeing is launching its fourth 737 Max final assembly line, the "North Line," at its Everett, Washington factory to increase production of Max 8, 9, and eventually 10 aircraft.
The new line utilizes space freed up by the end of the 747 program and the relocation of part of the 787 assembly line.
This expansion will incrementally boost monthly 737 production from 42 to 47 aircraft, with plans to reach 52 by early 2027 and potentially 70 per month in the future.
The production increase comes after FAA-imposed caps following the January 2024 Alaska Airlines 737 Max 9 door plug incident and ongoing efforts to improve Boeing's manufacturing processes.

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Starting Monday, the Boeing factory in Everett, Washington, will be turning out finished 737 Max aircraft. According to the aerospace giant, the “North Line,” as it is called, represents the fourth final assembly line for the jet.

The factory is located north of Seattle on 1,000 acres at Seattle Paine Field International Airport (KPAE). The complex is basically a small city within the boundaries of Mukilteo, Washington, and Everett. Boeing has its own fire department, gymnasium, and multiple restaurants to accommodate its approximate 30,000 employees.