What kind of information is noted in Block 19?

Block 19 is used to capture the proposed departure time and fix. This information is crucial for effective air traffic management and coordination, as it helps controllers anticipate and plan for the aircraft's departure. By noting the proposed departure fix, controllers can monitor the aircraft's path and ensure that the necessary airspace is ready for its planned flight route. This block allows for better scheduling and enhances safety by enabling air traffic controllers to manage the flow of air traffic efficiently.

The choices regarding pilot and center estimated times provide valuable information but focus on different aspects of flight data. Proposed departure time and fix directly relate to the planning phase, while the estimated times pertain more to actual flight progress and may change based on various factors affecting the aircraft's flight. Actual time over fix, while important, involves already executed actions, contrasting with the forward-looking nature of the information in Block 19.