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

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.

Boeing Co. delivered 33 jets in September, a decrease from the 40 aircraft it handed over in August, as the ongoing machinist strike weighs heavily on its production capabilities. The strike, which began on September 13,