A no-fly zone (or no-flight 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 nation from operating in the region.
Famous quotes containing the word zone:
“The human race is a zone of living things that should be defined by tracing its confines.”
—Italo Calvino (1923–1985)