How come there is no thread on the RealityCheck?

I cannot speak for Jaycoy, of course, but I think both of your senses of air are tightly related. With the greater quiet and blackness of the noise background comes more information on the venue including ambience and reverberation. I would characterize it as sounding more real or having a sense of being there.

Tvad, yes now that you mention it, so have I. There is no loss of highs with the RC copies, however.

airy - Pertaining to treble which sounds light, delicate, open, and seemingly unrestricted in upper extension. A quality of reproducing systems having very smooth and very extended HF response. (Stereophile Glossary)