Boeing's shares are trading lower due to potential credit downgrades from S&P Global and Moody’s, driven by a machinist union strike and financial complications. The strike, now in its fourth week, is costing Boeing over $1 billion monthly and threatens production goals. Additionally, the FAA has issued a warning about a potential rudder system malfunction in Boeing 737 planes, adding to safety concerns. Despite these challenges, some investment firms maintain buy ratings on Boeing, while others are more cautious.