P-56A & B are prohibited areas surrounding the White House, the National Mall, and the vice president's residence in Washington, D.C.
The only aircraft that are allowed to fly within these prohibited areas are specially authorized flights that are in direct support of the U.S. Secret Service, the Office of the President, or one of several government agencies with missions that require air support within P-56. These prohibited areas have been in effect for about 50 years.
P-56A covers approximately the area west of the Lincoln Memorial (Rock Creek Park) to east of the Capitol (Stanton Square) and between Independence Avenue and K Street up to 18,000 feet.
P-56B covers a small circle with a radius of about one nautical mile (about 1.2 statute miles) surrounding the Naval Observatory on Massachusetts Avenue up to 18,000 feet.