No fly over Libya - a potentially embarrassing precedent

I suppose we should not be surprised at the USA being opposed to a 'No-Fly' zone over Libya in the absence of a highly improbable UN Resolution. After all when the Israel Air Force was bombing & shooting up civilians in GAZA there was a minimal amount of ritual hand wringing by the US but nothing effective, let alone a 'no fly' zone, was ever proposed. Suppose Israel wants to do it again with impunity - a fairly probable scenario? A 'no fly' sanction on their Libyan copyist would be deeply embarrassing.