Category:No Fly Zone

A no-fly zone or no-flight zone (NFZ), or air exclusion zone, is a territory or an area over which aircraft are not permitted to fly. Such zones are usually set up in a military context, somewhat like a demilitarized zone in the sky, and usually prohibit military aircraft of a belligerent power from operating in the region. Aircraft that break the no-fly zone may be shot down, depending on the terms of the NFZ.

Source: Wikipedia

Countryballs listed to this category having their air territory or part of their air territory are subjected to NFZ.