[Code of Federal Regulations] [Title 14, Volume 2] [Revised as of January 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR99.49] [Page 299] TITLE 14--AERONAUTICSAND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) PART 99--SECURITY CONTROL OF AIR TRAFFIC--Table of Contents Subpart B--Designated Air Defense Identification Zones Sec. 99.49 Defense Area. All airspace of the United States is designated as Defense Area except that airspace already designated as Air Defense Identification Zone.