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, initially increasing monthly 737 production from 42 to 47 aircraft.
This expansion at the facility, formerly home to the 747 program, utilizes space freed up by the end of 747 production and relocation of some 787 assembly.
The production increase is a managed step in collaboration with the FAA, following caps imposed after the 2024 Alaska Airlines 737 Max 9 door plug incident, with Boeing aiming for 52 aircraft monthly by early 2027.

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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.