Great, thanks. A poster on flyertalk.com said US pays for each visit by a US Club member to a Red Carpet Club. My suspicion is this cost is getting much higher for US than it is for UA (meaning US pays UA every month instead of having it balance out). I wonder if they're going to make Club access more like the Star Alliance, where Star Alliance Gold members can use a reciprocal club under very specific circumstances.
If cost is really an issue, I'd like to see US-UA negotiate an agreement where US elite members can buy a Red Carpet Club at the same rates UA charges its elite members, and vice versa. This is something I could swing quite easily at work.