What is the 12-hour block of time that a reserve line holder must be available to work called?

The correct term used to describe the 12-hour block of time that a reserve line holder must be available to work is "Reserve Status." In the context of flight operations, reserve status refers to the specific hours during which crew members, particularly those on reserve, must be ready to be called for duty assignments. This period is essential for ensuring that there are sufficient crew members available to cover unexpected schedule changes, cancellations, or additional flights that may arise.

Reserve status is a critical aspect of a flight attendant's schedule, as it directly impacts their availability and duty assignments. It ensures that the airline can maintain its operational efficiency and meet FAA regulations regarding crew availability and duty time. Understanding this terminology helps flight attendants manage their schedules effectively and prepare for potential work calls within that designated time frame.