Can I say clear skies?
Can I say clear skies? Also as in a pilot being friendly and wishing you clear skies. This refers to both good flying weather clear of clouds, and little to no traffic, meaning clear flying.
Why do we say blue skies?
Our sky is colored because Earth has an atmosphere; it is blue because aerosol particles absorb and re-emit mostly blue light. Any celestial object that has an atmosphere can have a colored sky.