The delivery date revision of the long-delayed carbon-composite Dreamliner follows an assessment of the availability of an engine needed for the final phases of flight test this fall, Boeing said.
Boeing said it is working closely with Rolls-Royce Group PLC
Boeing had said last month that due to a series of issues, the first delivery of the 787 could be pushed a few weeks into 2011.
The plane maker said on Friday the schedule revision will not affect the company's financial outlook.
However, despite the delay, Boeing said the flight testing across the test fleet continues as planned.
(Reporting by Sakthi Prasad in Bangalore; Editing by Muralikumar Anantharaman)