MONTREAL - The heated battle between Boeing Co. and Bombardier Inc. over C Series sales in the United States will likely drag on regardless which side comes up short Friday in a U.S. International Trade Commission ruling. In new documents filed Wednesday, Bombardier said it expects Boeing will likely respond to a loss by filing a new petition once there is a new U.S. order for the C Series. "The threat of a new petition ? which Boeing has not disclaimed ...