Boeing has pleaded not guilty to a criminal charge in a case revolving around two crashes of Boeing 737 Max planes. A federal judge in Texas took Boeing's plea Thursday. The judge is considering whether to appoint a special monitor to examine safety issues at the company. It's an unusual case because Boeing thought it had settled the issue when it reached a deal with federal prosecutors two years ago. But relatives of some of the passengers who died are challenging the settlement because they weren't informed about secret negotiations between Boeing and the Justice Department.