I am looking into a flight from either ATL-MEL, or ORD-MEL. Certainly for a flight of this length, I will need to buy an upgradeable fare using UA miles. Is my only option to purchase an H fare on UA and upgrade on UA metal? Is there a way to buy an H fare with a codeshare on NZ, and upgrade with miles on them? How about on SQ? Do I have any options for upgrading using UA miles on any *A carriers? I thougth I ready in the sticky FAQ's that this was a new option?