How can you identify Class D airspace on a map?

Identifying Class D airspace on a sectional chart is accomplished through the use of dashed blue lines. This type of airspace typically extends upward from the surface up to 2,500 feet above ground level and is associated with airports that have an operating control tower. The dashed blue lines provide visual cues to pilots, indicating where this specific type of airspace begins and ends.

While solid blue lines indicate Class B airspace, solid magenta lines represent Class C airspace, and dashed red lines are not standard indicators used for any airspace classification in the context of general aviation charts, the dashed blue lines are the key feature for recognizing Class D airspace. Understanding these markings is vital for pilots to ensure they operate safely and comply with regulations when in or near controlled airspace.