By Jon Ostrower And Doug Cameron 

Boeing Co. executives moved to reassure investors that jetliner demand remained intact as it plans further production increases alongside an expanded cost-cutting program.

Slowing economic growth in emerging economies and recent moves by two U.S. airlines to defer new aircraft buys and continue flying older planes haven't altered strong demand, Boeing Co. Chief Executive Jim McNerney said Tuesday.

"Nothing about our fundamental view of the market has changed," Mr. McNerney said at Boeing's annual investor day in Chicago.

Concerns about economic growth, over-ordering and a sharp drop in jet fuel prices have unnerved some investors about the ability of Boeing and rival Airbus Group NV to sustain higher production rates, and though the oil benchmark has climbed in recent days, fleet planning changes by the parents of American Airlines and United Airlines added to the concerns.

Boeing is enjoying unprecedented demand for new jetliners, driven by the need to replace older fleets. Mr. McNerney said requests for cancellations and deferrals remained at historic lows, and pricing was steady as it targeted securing as many new orders for jets this year as it delivers, known as the book-to-bill ratio.

Following the protracted and expensive development of its advanced 787 Dreamliner, Boeing has moved toward increasing incremental updates to its existing aircraft, rather than undertake all-new designs. Boosting jet production and lowering costs are central to Boeing's effort to increase profits and shareholder returns, and buybacks remain a key priority for the company, which repurchased $2.5 billion in stock during the first quarter.

Mr. McNerney said the notoriously cyclical jetliner business has been fueled by pent-up demand held back in the years following the Sept. 11, 2001, terrorist attacks and stimulated by new technology on its 787. The result, he said, is a "supercycle" where expanding output and orders drastically outpaced an increase in flying. Mr. McNerney expected those production increases to moderate by the end of the decade, more closely matching a 5% annual increase in air travel.

"If there are no other [geopolitical] events" that disrupt demand, "that's the rate at which our production rates will be growing. I think it's not a matter of predicting a dip, it's a matter of returning to production rate increases that align with demand," he said.

Boeing has further expanded its cost-cutting push--known as Partnering for Success--to 500 suppliers from 150 and boosted the target for trimming expenses at its defense arm by an additional $1 billion, building on $5 billion in reductions already implemented. The aerospace giant has assigned 400 engineers to work with suppliers to make their operations more efficient.

Highlighting both the increasing demand and necessity of building more efficiently, Boeing Commercial Airplanes Chief Executive Ray Conner said the company will build 52 737s a month in 2018 inside the same industrial footprint at its Renton, Wash., factory as the one where it built 21 of the single-aisle jets each month early last decade. Mr. Conner reiterated the company's plans to accelerate output and said its industrial plans could accommodate as many as 60 737 jets each month, but that higher output would depend on market demand.

"You can take these rates down, you can take them up and still maintain the kind of efficiencies that you've seen with the higher rates," said Mr. Conner. "You create a lot of flexibility to respond to the market in a way without throwing your cost line off and being able to maintain your margins. Your revenue line may change a bit, but your margin line won't."

At the end of the first quarter, Boeing had more than 5,700 jets on order worth $435 billion at contractual prices.

The shares were recently down 0.2% at $145.65, narrowing earlier losses and in line with the decline in the broader market.

Write to Jon Ostrower at jon.ostrower@wsj.com and Doug Cameron at doug.cameron@wsj.com

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