Me and my husband have individually enough miles (in both Delta and AA) for a trip between SJU and Europe and we were planning to use them on next Sept. 2007. Recently I read that is better not to use the miles for an award coach class ticket but instead to upgrade to business class. Because I have never used miles for either case, what is the best option and how the 330 days rule applies in each case? How many miles are needed for the coach to business upgrade on an International flight?