Which of the following should be maintained on a flight progress strip?

The maintenance of flight progress strips is critical for ensuring efficient air traffic management. Only necessary current data should be kept on a flight progress strip because it streamlines the workflow for air traffic controllers. This approach allows controllers to focus on the most relevant information needed for decision-making and coordinating traffic. Keeping only essential information minimizes clutter on the strip, thus preventing confusion and errors.

In contrast, maintaining all historical data for the flight would lead to an overwhelming amount of information, making it difficult to quickly assess the current status of a flight. Projecting future flight paths, while important for planning, may not be directly relevant at the moment of control, as flight paths can change based on real-time conditions and adjustments. Weather updates, though critical for flight safety, are typically communicated through other means and do not belong on the flight progress strip itself. Thus, the emphasis on current and necessary data ensures that controllers have the most important information readily accessible.