I am only a CO Gold and usually credit my flights to CO. Most of my flights are on US regionals this year, so upgrades haven't been a priority. In a few weeks I have a UA metal flight where an upgrade may be possible as a PremEx. I had my CO status matched to UA. Do I use my UA number or my CO number? I know that the programs will merge in 2012, but I am hopeful that my 2011 mileage will qual me for CO Plat and hopefully UA 1K. Will they combine the two throughout the year if I call in and say "hey guys, look at my combined flying."