When leaving DIA Monday afternoon about 4:45PM I happened to see a UA 767 or 777 that was painted with a "Star Alliance" livery with SA logo on the tail, white body and words Star Alliance along the entire length. I was leaving on CO out of Terminal A so only saw it from across the tarmac as we pulled out. Is this something new or just a one-off advert? I rarely fly UA anymore, but am in and out of DIA several times a month. I only saw the right side of the plane. Is the other side in UA livery a la KLM/NW a few years ago? This was the first time I had seen such a paint scheme.