CDO stands for what in the context of flight duty periods?

The term CDO refers to Continuous Duty Overnight, which is relevant to flight duty periods as it describes a specific arrangement where crew members are required to perform their duties continuously overnight without a scheduled break or rest period. This concept is crucial in aviation because it has implications for crew scheduling, fatigue management, and compliance with regulations regarding maximum duty times. Understanding CDO is important for ensuring that crew members can perform their responsibilities effectively and safely, thus maintaining the overall safety and efficiency of airline operations.

While the other options mention roles or organizations related to crew duties or safety, they do not accurately represent the established concept of Continuous Duty Overnight that directly affects flight schedules and regulations.