Boeing managed to deliver a small number of 737 MAX jets after a strike by machinists shut down the Renton, Wash., factory that builds the planes. But deliveries are expected to slow substantially as the walkout stretches into its second month.

A machinist strike is now in its fourth week, halting work at Boeing's factories in the Seattle area. Boeing delivered 33 airplanes in September, six more than during the same period a year earlier, as the company and its customers keep an eye on the impact of a machinist strike,

Boeing delivered fewer airplanes in September compared with recent months and past years, as it felt the first effects of the ongoing Machinists strike.