battleskies en · NOUN
Etymology
From battle + skies.
Meanings
-
(plural, plural-only) The portions of airspace in which a military conflict is taking place.
Because military planes are worth more than their weight in gold when they're badly needed — and such is usually the case in the battleskies of the world today — Uncle Sam has developed the world's best masters of improvisation in his globe-covering Army Air Forces Air Service Command, the outfit that literally "keeps 'em flying."
1944, The Curtiss Flyleaf, volumes 27-28, page 3:War Production Board poster Production is your Protection - Back Up Our Battleskies!