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 activating a fourth 737 Max final assembly line ("North Line") at its Everett, Washington factory, utilizing space from discontinued programs.
This expansion will incrementally increase monthly 737 production from 42 to 47, with future targets of up to 70 aircraft per month.
The production increase comes after the FAA had capped output due to manufacturing and oversight issues highlighted by a 2024 737 Max 9 door plug blowout incident.

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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.