Boeing's eagerly anticipated 787 passenger jet has been delayed several times due to design issues.
The company said earlier that it needed to reinforce an area in the side of the aircraft.
"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," Boeing Chairman, President and CEO Jim McNerney, said in a statement. "The design details and implementation plan are nearly complete, and the team is preparing airplanes for modification and testing."
Boeing expects it will produce 10 airplanes per month in late 2013.
Boeing shares rose $2.72, or 5.7 percent, to $50.54 in premarket trading.
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