When upgrading TATL, it is 15,000 miles to upgrade IF you are booked in full-fare economy (Y or B)... and the only other time you can book w/ miles is when you are booked in M or H, where it costs 30,000 miles each way. It's not that hard to find upgradeable inventory IMHO. If ou book a month in advance, it is quite easy. I've yet to be turned down, even without status.