The Washington Air Defense Identification Zone ( surrounds the National Capital Region , which is composed of counties of states in the immediate vicinity of the District of Columbia , plus the city of Baltimore ) was created in 2003 though some sources refer to it as being created in response to the September 11 attacks . The reason for this confusion is that there are two other sets of flight restrictions over Washington , D.C. besides the DC ADIZ ( Washington , DC Metropolitan Area Flight Restricted Zone , FRZ , & Special Federal Aviation Regulation 94 , SFAR 94 or just plain Special Flight Rules Area , a zone which envelopes general aviation airports centered around Ronald Reagan airport ) established for the purpose . This ADIZ , however , shared none of the regulatory similarity with the border area ADIZes . This airspace was subsequently renamed the DC Flight Restricted Zone and Special Flight Rules Area to avoid confusion
September 11 attacks
September 11 attacks
Air Defense Identification Zone (North America)