14 C.F.R. § 93.335
For purposes of this subpart-
DC FRZ flight plan is a flight plan filed for the sole purpose of complying with the requirements for VFR operations into, out of, and through the DC FRZ. This flight plan is separate and distinct from a standard VFR flight plan, and does not include search and rescue services.
DC SFRA flight plan is a flight plan filed for the sole purpose of complying with the requirements for VFR operations into, out of, and through the DC SFRA. This flight plan is separate and distinct from a standard VFR flight plan, and does not include search and rescue services.
Fringe airports are the following airports located near the outer boundary of the Washington, DC Metropolitan Area Special Flight Rules Area: Barnes (MD47), Flying M Farms (MD77), Mountain Road (MD43), Robinson (MD14), and Skyview (51VA).
Washington, DC Metropolitan Area Flight Restricted Zone (DC FRZ) is an area bounded by a line beginning at the Washington VOR/DME (DCA) 311° radial at 15 nautical miles (NM) (Lat. 38°59'31" N., Long. 077°18'30" W.); then clockwise along the DCA 15 nautical mile arc to the DCA 002° radial at 15 NM (Lat. 39°06'28" N., Long 077°04'32" W.); then southeast via a line drawn to the DCA 049° radial at 14 NM (Lat. 39°02'18" N., Long. 076°50'38" W.); thence south via a line drawn to the DCA 064° radial at 13 NM (Lat. 38°59'01" N., Long. 076°48'32" W.); thence clockwise along the 13 NM arc to the DCA 276° radial at 13 NM (Lat.38°50'53" N., Long 077°18'48" W.); thence north to the point of beginning, excluding the airspace within a one nautical mile radius of the Freeway Airport, W00, Mitchellville, MD from the surface up to but not including flight level (FL) 180. The DC FRZ is within and part of the Washington, DC Metropolitan Area SFRA.
Washington, DC Metropolitan Area Special Flight Rules Area (DC SFRA) is an area of airspace over the surface of the earth where the ready identification, location, and control of aircraft is required in the interests of national security. Specifically, the DC SFRA is that airspace, from the surface to, but not including, FL 180, within a 30-mile radius of Lat. 38°51'34" N., Long. 077°02'11" W., or the DCA VOR/DME. The DC SFRA includes the DC FRZ.
14 C.F.R. §93.335