What does the symbol "‡" indicate?

The symbol "‡" is used in aeronautical charts and documents to indicate that the effective hours of operation for a facility are one hour earlier than shown during daylight savings time. This is particularly important for pilots and flight planners to be aware of, as it can impact flight planning and operations. Daylight savings time can confuse the scheduling of air traffic facilities, and knowing the adjusted time allows for better planning and adherence to regulations.

This symbol serves as a reminder to verify the operational hours, ensuring that flights are conducted within the appropriate timeframe. It is crucial for safety and compliance with aviation regulations, and understanding this symbol helps to avoid scheduling conflicts or operational issues related to air traffic control services or airport operations.