CAT Lebensraum aerospace aerosphere air hole air pocket area back country belt bump ceiling clear space clearance clearing confines continental shelf corridor country crosswind department desert distant prospect district division elbowroom empty space empty view environs favorable wind fog front glade ground head wind headroom heartland high-pressure area hinterland hole ionosphere jetstream land latitude leeway living space low-pressure area margin milieu neighborhood offshore rights open country open space outback overcast part parts place plain play pocket prairie precincts premises purlieus quarter region room room to spare roughness salient sea room section soil soup space spare room steppe stratosphere substratosphere swing tail wind terrain territory three-mile limit tropopause troposphere trough turbulence twelve-mile limit vicinage vicinity visibility visibility zero way wide-open spaces wilderness zone