AIRSPACE INFORMATION (Continued) Special Flight Rules Area (SFRA) Special Use Airspace Only the airspace effective  below 18,000 feet MSL is  shown. The type of area shall be  spelled out in large areas if  space permits. * Alert Areas do not extend  into Class A, B, C and D  airspace, or Class E airport  surface areas.  Special Air Traffic Rules / Airport Patterns (FAR Part 93) Appropriate boxed note as required  shown adjacent to area. Inside the FAR Part 93 boundary  area, the cross hatching is at a 45  degree angle. The hypsometric tint  shall be masked within the area  around the yellow city tint when  applicable (should not be confused  with white glacier tint). Flight Restricted Zone (FRZ) Relating to National Security National Security Area FOR REASONS OF NATIONAL SECURITY PILOTS ARE REQUESTED TO AVOID FLIGHT BELOW 1200' MSL IN THIS AREA NOTICE Small Area Appropriate notes as  required may be shown Special Awareness Training Areas Mode C (FAR 91.215) Appropriate notes as  required may be shown. Air Defense Identification Zone (ADIZ) Note: Delimiting line not  shown when it coincides with  International Boundary,  projection lines or other linear  features.  FAA Chart Users’ Guide - VFR Symbology - Sectional and Terminal Area Charts 30