...WASHINGTON D.C. (Standard & Poor's) Oct. 27, 2015--Standard & Poor's Ratings Services today assigned its 'A' issue-level rating to Seattle-based aircraft manufacturer and defense contractor Boeing Co.'s proposed senior unsecured notes. The company plans to issue the notes in three tranches due 2020, 2022, and 2025, and we expect that it will use the proceeds for general corporate purposes. We do not believe that the proposed transaction would significantly alter the company's credit metrics, therefore our other ratings on the company remain unchanged. Our ratings on Boeing reflect its position as one of the two global producers of large commercial jetliners and as one of the largest U.S. defense contractors. They also reflect the cyclical and competitive nature of the commercial aviation market, the budget pressures affecting U.S. defense spending, and the significant investments required to develop new aircraft. We expect that Boeing's credit ratios, which are currently very strong, will...