UPDATE 1-U.S. Air Force says Pratt to build engines for new bomber
March 07, 2016 at 18:03 PM EST
WASHINGTON, March 7 (Reuters) - The U.S. Air Force on Monday named Pratt & Whitney as the engine maker for the new Northrop Grumman Corp long-range strike bomber, and defended the plane's "cost plus incentive fee" contract that has been challenged by U.S. lawmakers.