Boeing's much-delayed 787 Dreamliner has lost another 25 orders to the aviation downturn, the planemaker revealed on its order Web site Thursday.

Boeing’s much-delayed 787 Dreamliner has lost another 25 orders to the aviation downturn, the planemaker revealed on its order Web site Thursday.

With just weeks to go before its first flight, the Dreamliner program has now lost a total of 57 orders since the beginning of the year and taken in only one new Dreamliner order for eight of the jets, for a net decrease of 49 in the sales tally.

The plane still has a hefty 861 orders on the books.

Boeing’s weekly order update included orders for 13 of the single-aisle 737s as well as the order announced this week for five 777-300ERs for Turkish Airlines. But it also included one 777 cancelation. Boeing did not identify any of the customers canceling orders.

So far this year, the net order tally stands at -1, with 50 canceled airplanes and 49 new orders.

The impact of the losses is greater in dollar value, because most of the new orders are single-aisle jets, while most of the canceled orders are expensive widebodies.

The net cancelations are valued at about $5.5 billion, using market pricing data from aircraft valuation firm Avitas. By the same estimates, the net new orders are worth just over $3 billion.

Orders for the full month of April show a sharp sales decline compared to the previous year. Boeing won orders for 17 jets last month, down from 58 in a year earlier.

But production is steady for now. The planemaker delivered 39 jets in April, down just one from 40 rolled out a year earlier.

Production is expected to decline sharply next year in response to cancelations and deferrals by airlines that cannot use the new airplanes with air traffic depressed by the economic downturn. Boeing has announced last month that the 777 production rate will be cut from 7 to 5 a month in mid 2010.

Dominic Gates: 206-464-2963 or dgates@seattletimes.com