US judge rejects Boeing's plea deal in a case stemming from fatal plane crashes

Boeing faced legal issues with the US government due to two fatal 737 Max crashes. The company agreed to plead guilty to conspiracy to defraud the US, resulting in a $487 million fine. An independent monitor was appointed to oversee Boeing's safety and quality control, but the selection process raised concerns with the judge, who preferred court involvement over the Justice Department's choice.

What was the charge that Boeing agreed to plead guilty to?

What concerns did Judge Reed O'Connor express regarding the independent monitor?