Special use airspace
Special use airspace (SUA) is airspace designated for operations that may cause limitations on other, uninvolved aircraft. These operations are often military. Designating these sections of airspace helps inform pilots about the potential hazards so that they can be easily avoided.
Most SUAs are depicted on aeronautical charts and, in the United States, listed on FAA websites.
The International Civil Aviation Organization defines SUAs as Flexible Use of Airspace (FUA), an airspace management concept where airspaces should never be designated as purely civil or military, but rather as a continuum in which all user demands are accommodated to the greatest possible extent.