Boeing delivered 60 airplanes last month, the most since December 2023, as the plane maker seeks to raise production of its bestselling 737 Max jets after a series of manufacturing and safety problems.

The tally was the highest since before a door plug from one of its new 737 Max 9 planes blew out midair in January 2024, sparking a new crisis for the company and slowing production and deliveries of aircraft. Of the monthly total, 42 were 737 Maxes, going to customers including Southwest Airlines, Alaska Airlines and United Airlines.

CEO Kelly Ortberg, who took the top job at Boeing last August, has said the company has made progress in improving production rates and quality on its factory lines.

For the three months ended June 30, Boeing handed over 150 airplanes, its best second quarter since 2018, before two crashes of Max planes five months apart grounded the jets and sparked a multiyear crisis at the top U.S. exporter. That was also the last year Boeing posted an annual profit. Its problems also gave rival Airbus a bigger lead over Boeing.

Boeing this spring had been producing about 38 Max aircraft a month and will need Federal Aviation Administration approval to go above that limit, which the agency set after the door plug accident. Ortberg said at a Bernstein investor conference in late May that he’s confident that the company could increase production to 42 of the jets a month.

The company booked 116 gross orders in June, or 70 net orders when including cancellations and accounting adjustments. Boeing often removes or adds orders to its backlog for a variety of reasons including customers’ financial health.

Boeing’s backlog stood at 5,953 as of June 30.

The manufacturer is set to report second-quarter financial results on July 29, when investors will be focused on Ortberg’s plan to increase production and aircraft deliveries.

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