* Current pace would put deliveries below full-year target
* Boeing delivered 12 more planes in April than a year ago
* Boeing says "progressing well" in solving S. Carolina problems (Adds Boeing comment in paragraphs 6-8)
By Alwyn Scott
NEW YORK, May 8 (Reuters) - Boeing Co's pace of commercial airplane deliveries slowed to 56 in April, or 10 fewer than the month before, keeping it under the target needed to meet its annual delivery forecast.
The company remained the world's biggest plane maker, however, besting the 52 jets that rival Airbus delivered in the month.
Investors watch jet deliveries because Boeing and Airbus receive the bulk of the cash for jet sales when customers fly them home. Boeing investors are particularly keen to see deliveries rise to supply cash for share buybacks and dividends and to work off $25 billion in deferred costs associated with the 787 Dreamliner.
Boeing's April delivery decline mainly reflected the fact that it delivered 39 narrow-body 737s, down from 44 in March.
The company also delivered just eight 787s and eight 777s in April, down from 10 each in March, and it delivered one 747, down from two in March.
Boeing said the delivery decline from March was less significant than the growth in output over the last year. The company noted that it delivered 12 more planes in the latest month than in April 2013, reflecting rising production rates.
"Month-to-month variability is normal and is dependent on factors such as customer preference for deliveries," said spokesman Chaz Bickers.
Boeing still expects to deliver 715 to 725 commercial airplanes this year, he added.
Separately, Boeing's net orders rose by three 737s in the week through May 6, reflecting 10 new orders for 737s, and cancellations of seven 737 planes.
Boeing is trying to increase production of its 737 to 42 a month in the current quarter and to 47 a month by 2017.
Airbus is currently making its rival A320 jetliner at a 42-a-month rate and aims to hit 46 a month in the second quarter of 2016.
Boeing also is increasing the rate of its 787 production to 10 a month, and said in January that it had rolled out the first jet built at that rate.
Production issues arose at the 787 assembly plant in South Carolina earlier this year, prompting Boeing to hire hundreds of contractors and send unfinished work to the factory in Everett, Washington, for completion.
Boeing said it is "progressing well" in reducing production problems in South Carolina, but declined to give details. Workers there are due to receive a bonus this month if they meet productivity targets.
If Boeing sustains the pace seen in the first four months of 2014, it would deliver about 651 jets this year. Boeing delivered 648 jetliners last year.
Delivery rates can lag production, however, because after a plane rolls out of the factory it undergoes testing before it is accepted by a customer.
Airbus has said it expects to deliver about 626 jets this year, the same number as in 2013.
Boeing shares were up 0.2 percent at $130.62 just before the close of trading on Thursday. (Additional reporting by Harriet McLeod in Charleston, S.C.; editing by Matthew Lewis)