As of today, United has brought back Star Alliance upgrade awards, which they got rid of a while back, probably because it cost them too much. While this isn’t all that useful to most of us in almost all cases, this is great for certain types of travelers, especially full fare coach business travelers (which I know there are many of). Basically, you’re able to upgrade a Y or B fare to business class and C or D fares to first class on select Star Alliance airlines. The chart for upgrades from coach to business doesn’t look half bad, actually, but upgrades to first class seem outrageously expensive. Details along with the participating airlines can be found here, while the upgrade award chart can be found here.