On a sectional chart, a solid blue line typically indicates the boundary of:
Why →
Class B airspace is depicted on sectional charts with solid blue lines. Class C uses solid magenta lines, and Class D uses dashed blue lines.The trap →
Blue lines appear for both Class B (solid) and Class D (dashed). The color AND line style both matter. Solid blue = Class B.SOURCE → FAA Aeronautical Chart User's Guide, FAA Remote Pilot Study GuideCHECKED APR 21ACS II.A.K2EASY