The Libya conflict could finally provide a definitive example of an air-only* campaign.
Perhaps in the conventional sense, but the purist might argue (playing Devil's Advocate here
) that there already are boots on the ground...albeit in the form of a rag-tag army of ill-equipped and trained rebels. Nonetheless, what air is doing here could definitely be described as support to grounded forces in some guise or other.
The overwhelming use of air power in Libya would appear to be demonstrating the size off the odds facing ground forces that can be overcome, and the limited ability required of those ground troops to hold (and even take) the ground when air has done its job so well.