The term 'Plane Site' can be broken down into two crossword solutions: 'HANGAR' (6 letters) and 'SKY' (3 letters). A HANGAR is a large, enclosed structure used to store and maintain aircraft. It is typically found at airports and airfields. SKY is a term used to describe the atmosphere or the expanse of space that seems to surround the earth. It is often used to refer to the clouds, stars, and other celestial bodies that can be seen in the night SKY.