Boeing Company (NYSE: BA) yesterday (Thursday) announced it would test-fly its 787 Dreamliner later this year but disappointed customers by delaying delivery of the plane until the fourth quarter of 2010.

Wall Street cheered the announcement as Boeing’s stock soared more than 6% in New York trading after the company said it still expects the 787 to be profitable.

The rally came despite news that costs for the first three test planes would be charged-off as having no commercial value, resulting in an estimated pretax charge of $2.5 billion, or $2.21 a share, in the third quarter. Boeing said the charge wouldn’t affect its cash flows.

“This new schedule provides us the time needed to complete the remaining work necessary to put the 787’s game-changing capability in the hands of our customers,” said Boeing Chief Executive Officer Jim McNerney.

The 787, already two years behind its original schedule, was scheduled for its