What type of airspace is indicated by a solid blue line on a sectional chart?

A solid blue line on a sectional chart indicates Class B airspace. This type of airspace is typically associated with busy airports and is designed to provide air traffic control services to aircraft operating in the vicinity of these airports. Class B airspace generally extends from the surface up to 10,000 feet MSL (Mean Sea Level) and requires pilots to maintain two-way radio communication with air traffic control. To enter this airspace, pilots must have an appropriate clearance, and aircraft must be equipped with a transponder.

Class B airspace is differentiated visually on charts by the solid blue lines, which help pilots identify the boundaries and understand the specific requirements associated with flying within this controlled airspace. That understanding is crucial for safety and effective navigation in crowded air traffic environments.