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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, now in its fourth week.

Through September, Boeing has handed over 291 aircraft, well below the 371 it had delivered in the first nine months of 2023. Rival Airbus has delivered 447 airplanes this year through August,

Last month's deliveries were led by 27 of Boeing's bestselling 737 Max aircraft to customers including United Airlines , which received five, and Ryanair and Southwest Airlines , which each each took three. Deliveries are key to Boeing. It's already burned through more than $8 billion this year since customers pay the bulk of the price when they receive the airplane.

The aircraft are produced in Renton, Washington, one of the factories where machinists walked off the job on Sept. 13 after workers overwhelmingly voted down a tentative agreement the company had reached with their union. The two sides are back at the negotiating table this week, though the union dismissed a sweetened offer from Boeing last month.

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