Almost none. I vaguely remember one in the Hong Kong RCC last year.

The difference between RCC and CR is that RCC has free snacks, the CR has free drinks. Other than that, they're pretty similar.

FWIW, the Delta-United club and miles deal was started when there was speculation about the two airlines merging. They have this loose arrangement, and then United started their pursuit of USAir. (Or, more accurately, Wolf tried to sell yet another airline, much as he did with Flying Tigers and United).

Pure speculating, but I doubt the United-Delta partnership will last much longer. I cannot how these airlines gain much from this. As a 1K, I don't get bonus miles when I fly Delta, I don't get upgrades, and the miles don't count towards my 1K status. The only real benefit is the RCC/CR access.

Unless Delta and United talk again about merging ...