By Angela Chen And Jon Ostrower 

Boeing Co. reported a jump in earnings for the latest quarter as it continued to deliver commercial jets at a record pace despite supply-chain glitches, but a sharp drop in cash flow for the period disappointed investors.

The aerospace giant also said on Wednesday that accumulated costs for its flagship 787 Dreamliner program, already higher than expected, continued to rise--though it reiterated projections that the costs would top out later this year and analysts said it appears to be making progress.

Chicago-based Boeing's factories for both twin and single-aisle aircraft are running at higher production rates than ever before, and the company said it is sticking to plans to hand over between 750 and 755 jetliners in 2015, compared with 723 last year.

A shortage of business-class seats made by French supplier Zodiac Aerospace has slowed completion of some Dreamliners for customers like American Airlines Group Inc. and Etihad Airways. And Boeing in the first quarter also had to contend with supply-chain disruptions caused by a labor dispute at West Coast ports.

But Boeing Chief Executive Jim McNerney said the company expects the seat issue to be resolved in the next couple months, and doesn't expect it to interrupt its production plans. "All the problems are not resolved, but we do have high confidence in the plan to resolve them," he said on a conference call.

Boeing reported a profit of $1.34 billion, or $1.87 a share, for the latest period, compared with $965 million, or $1.28 a share, a year earlier. Core operating earnings, which exclude items including pension components related to market fluctuations, improved to $1.97 from $1.76.

Boeing has emphasized the importance of cash flow as a measure of its performance. In the latest period, its free cash flow plunged to negative $486 million, far off analysts' expectations and a $1.1 billion swing from the positive $615 million a year earlier.

Boeing shares were down 1.8% in midafternoon trading, which analysts attributed to the cash-flow number. "Boeing is perhaps learning the hard way that if you tell investors to focus on the cash flow, then you had better deliver it," wrote Robert Stallard of RBC Capital Markets.

Boeing attributed the lower cash flow to the timing of receipts and expenditures like customer advances and maintained its forecast for strong positive cash flow for the full year.

It also stuck to plans for returning cash to shareholders, saying it bought back 17 million shares in the quarter for $2.5 billion. Chief Financial Officer Greg Smith said that it plans to spend the remaining $9.5 billion in its stock buyback plan over the next two to three years.

Boeing's defense and space unit posted increased margins, despite an overall drop 12% drop in revenue to $6.7 billion during the first quarter and 4% lower earnings that it attributed to delivery timing.

Mr. McNerney continued to be optimistic about demand for new jetliners despite geopolitical instability and lower oil prices that some analysts fear diminishes the need for new, fuel-efficient planes. Deferrals and cancellations of plane orders are running below historical averages, he said, and the company is still expecting its order book for 2015 to at least equal its output and its supply chain is ready to accelerate single-aisle jet production if it decides to push even higher than its announced rates.

Boeing delivered 184 jetliners in the first quarter, an increase of 14% over the same period in 2014, increasing its commercial airplane unit revenue by 21% to $15.4 billion. Profit margin in the unit fell 1.3 percentage points to 10.5%, though, as deliveries of the advanced 787 accelerated.

Boeing has sought to aggressively cut production costs for the 787, reworking factory processes and supplier contracts to turn each delivery cash positive. Boeing's deferred production costs--or accumulated unit losses--for the program rose another $793 million in the quarter to $26.94 billion. The company had expected those costs to peak at roughly $25 billion, but they have continued to climb, partly because each plane has been more labor intensive than anticipated.

Boeing says the 787 program is profitable based on accounting that spreads the high early costs of the program over a block of 1,300 deliveries.

Mr. Smith said Boeing expects the deferred production costs to continue growing at roughly the same pace in the next two quarters, but maintained expectations it would break even on each delivery late this year. Mr. Smith said positive program cash flow will accelerate when production increases to 12 jets a month near the end of 2016. Half of its Dreamliner deliveries in 2015 are expected to be the larger, and comparatively higher-priced, 270- to 290-seat 787-9, which entered service last year, Mr. Smith said.

Robert Spingarn, an analyst for Credit Suisse, wrote in an investor note that the program's cost reduction "finally showed a meaningful decline," estimating that the losses on each delivery had fallen to $26.4 million per unit above its average sales price, from $32 million in the fourth quarter and $50.1 million early last year.

Angela Chen contributed to this article.

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

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