**Aircraft maker Boeing has blamed a third-quarter net loss of $1.6bn (£974m) on rising production costs and poor market conditions.**The latest results reflect charges incurred to modify Boeing’s 787 Dreamliner and the new updated version of its 747 jumbo jet.
The steeper-than-anticipated loss has led the company to cut its profit forecast for 2009.
Shares in the firm fell 2.4% to $50.64 after the figures were announced.
The loss compares with a profit of $695m made in the same period a year earlier.
In August, Boeing said it would take a charge of $2.5bn because the first three test Dreamliners were undergoing so much modification that they had no commercial market value.
The company then added a $1bn charge for higher costs and lower demand than it expected for the 747-8.
Boeing also said that it would postpone the first flight of the freighter version of the 747-8 to 2010.