What does the term "Blue Airport" signify in aviation?

The term "Blue Airport" signifies an airport that offers an instrument approach. In aviation charts, particularly in sectional charts used by pilots, airports are depicted with various symbols and colors. Airports identified with a blue symbol indicate that they have published instrument approaches, which means pilots can utilize these procedures for landing when flying under Instrument Flight Rules (IFR).

This distinction is crucial for pilots, especially those operating in low visibility or adverse weather conditions, where instrument approaches are necessary. The availability of an instrument approach provides the necessary procedural guidance for transitioning from the en-route phase to landing, enhancing safety and operational efficiency. In contrast, airports that do not offer such approaches are depicted with different markings, which serves as an important indicator for pilots when planning their flights and approaches.