NEW YORK (Dow Jones) -- Shares of Boeing Co. (NYSE:BA) dropped Wednesday after Goldman Sachs downgraded the stock to sell from neutral on expectations that a weaker economy and high jet-fuel prices are likely to translate into significantly fewer aircraft orders.

"We also expect consensus estimates to be revised down as delivery rates and margin expansion, which is driven by rising delivery rates and pricing from strong orders, will likely disappoint," the investment firm wrote in a note to investors.

Boeing (NYSE:BA) (BA), part of the Dow Jones Industrial Average, traded down nearly 6.3% at last check to $70.11 a share.

Additionally, Goldman Sachs said it expects more problems with the 787 Dreamliner program as the new plane begins its first flight tests later this year.

The downgrade also seemed to hurt shares some of Boeing's (NYSE:BA) largest suppliers. Honeywell International (NYSE:HON) (HON) fell 5.8% to $51.27; BE Aerospace Inc. (NASDAQ-NMS:BEAV) (BEAV) plunged 12.3% to $26.66; Spirit AeroSystems Holdings Inc. (NYSE:SPR) (SPR) lost 6.6% to $ 22.09; and Precision Castparts Corp. (NYSE:PCP) (PCP) shed 5.5% to $103.06.

    (END) Dow Jones Newswires   06-25-08 1538   Copyright (c) 2008 Dow Jones & Company, Inc.