http://mileageplusmergerupdates.com/en/mp/Welcome UA has made it official, going to four tiers: Premier Silver (25K miles), Premier Gold 50K) , Premier Platinum (75K), and Premier 1K (100K). Actually 5 tiers if you add a "Global Services" (invitation only) across the top, a tier that somehow brings AA and Mr. George Clooney to mind. Anyway, my personal preference would certainly not be that AA move to 4 tiers (this was discussed earlier this summer at length here). To be fair to UA and CO, UA is also today announcing a liberalized million-miler grid that goes all the way up to lifetime Global Services for 4 million miles lifetime. They are clarifying which miles count, they say that this is the best lifetime structure in the industry, though it certainly is not as liberal as what AA's used to be. My personal, selfish preference would be that AA not copy all this lockstep and instead stick to what it has announced. Do other AAdvantage elite members have different opinions?