Original District of Columbia ADIZ
The original Washington ADIZ was somewhat larger and was roughly co-extensive with the Class B airspace around Washington. On August 30, 2007, the ADIZ was changed to a circle surrounding Washington, D.C., with a radius of 30 nautical miles (60 km), with a small triangular cutout for Leesburg Executive Airport. This change reduced the size of the ADIZ by 1,800 square miles (4,700 km2) and removed 33 airports from its coverage.
Read more about this topic: Washington, DC Metropolitan Area Special Flight Rules Area
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