I planned to travel to Europe in January on Swiss YUL-ZRH-AGP. I'm thinking to pay the 4 coach tickets and try to upgrade them using my cheap US Airways miles. I have booked a few tickets on aeroplan but it is the fist time that i will try a *A upgrade using miles. I know that i see the avaibility of the upgrade on expertflyer, but how difficult it is to upgrade the 4 coach tickets to bussiness on Swiss??? Do US Airways is doing some blocking on the upgrades with Swiss or with *A partners???