The Baa3 rating assigned by Moody's to Boeing's new senior unsecured notes indicates a moderate credit risk level. This rating is at the lower end of investment-grade credit ratings, suggesting that while Boeing faces certain financial risks, it maintains a decent ability to meet its financial commitments. This rating could influence investor perception by highlighting Boeing's current financial health and stability, potentially affecting its stock price. However, since the rating is still within the investment-grade category, the immediate impact on Boeing's stock price might be neutral, as investors may have already anticipated this level of creditworthiness.