This summer, Boeing is opening its fourth 737 MAX assembly line — the North Line — at its Everett, Washington factory. It's the first time the 737 will be built outside Renton, where three existing MAX lines operate.
The new line uses floor space freed up by the end of 747 production in 2022 and the move of 787 assembly to South Carolina. It will build all MAX variants, with the 737-10 produced predominantly at Everett. Wings will be ferried up from Renton using a new 737 Wing Transport Tool.
Ramp-up is deliberately slow. Boeing must stabilize Renton at 42 jets per month before the FAA will authorize a jump to 47; anything above that rate will be built at Everett. The 47-per-month milestone, once expected in 2026, has slipped to 2027, with a long-run goal of 63.