By Jon Ostrower 

Boeing Co. will slow production of its 747 jet to just one a month in 2016, though the plane maker said it remains committed to the jet and expects a recovery in the air cargo market to drive future sales.

The company has just 32 firm orders for the upgraded 747-8 version of the jumbo as of the end of May, and sales have been sluggish as airlines and air cargo operators opted for the biggest twin-engine jets such as the Boeing 777 or Airbus 330 to handle long-range routes.

The updated 747-8, which was introduced in 2011 and comes in passenger and freighter versions, had been viewed by analysts as one of the key early challenges for incoming Chief Executive Dennis Muilenburg.

Slowing production to extend the program's life also allows Boeing to remain on track to supply 747s to replace the aircraft that serve as Air Force One, the U.S. presidential transport.

The larger and more fuel-efficient 747-8 was selected in January to replace two heavily-modified Boeing 747-200 planes used by the president that are due to reach the end of their planned 30-year life in 2017. Boeing has yet to be awarded a contract, though the planes are expected to come into service in 2021 following several years of modifications and testing.

Boeing has repeatedly cut 747 production, from an initial 1.75 a month to 1.5 at present, and plans to slim this to 1.3 in September before its latest cut, coming in March. The one-a-month rate is still profitable for the company, executives have said, but Boeing jet programs rarely have dropped below this level.

A commitment signed at the recent Paris Air Show for Russian cargo operator Volga-Dnepr Group to acquire up to 20 of the freighter versions may provide Boeing with some breathing room to secure additional sales and keep the production line open, but the agreement has yet to be firmed up and exactly how many jets would be delivered and over what period is still unclear.

The production slowdown could actually ease some financial pressure on Boeing as 747-8 sales have been heavily-backed by the Export-Import Bank of the U.S., whose future remains in limbo.

Standard & Poor's said Wednesday that Boeing could face a credit downgrade if it is forced to step in and provide additional financial support if Ex-Im is closed or required to limit its support for jets.

Boeing has said it may temporarily provide financing for some aircraft purchases by airlines caught up in the uncertain future of Ex-Im, with its mandate due to expire on June 30.

The plane maker's customers are the largest users of the Ex-Im Bank, whose guarantees secure billions of dollars in commercial funding annually. And Boeing, as one of the most vocal proponents of reauthorizing the government-backed corporation, would have no alternative because rival Airbus Group SE is able to rely on European export credit agencies to support some of its jet sales.

Standard & Poor's said it didn't expect Boeing to have to finance itself all of the deals now supported by Ex-Im. However, it singled out the potential need for Boeing to have to use its finance arm to back planes such as the 747-8 that have been tougher to fund without the federal agency's guarantees.

Cargolux Airlines International SA and Korean Air Lines Co. have all used the bank to finance 747-8 deliveries.

Doug Cameron contributed to this article

Write to Jon Ostrower at jon.ostrower@wsj.com

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